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AA Auto AnswerAAA Authentication, Authorization andAccountingAAB All-to-All BroadcastAAC Advanced Audio CodingAACS Advanced Access Control SystemAAL Asynchronous Transfer Mode AdaptionLayerAAM Automatic Acoustic ManagementAAP Applications Access Point [DEC]AARP AppleTalk Address ResolutionProtocolAAS All-to-All ScatterAASP ASCII Asynchronous Support PackageAAT Average Access TimeAATP Authorized Academic Training Program[Microsoft].ABA Address Book Archive (file nameextension) [Palm]ABAP Advanced Business ApplicationProgramming [SAP]ABC * Atanasoff-Berry Computer (Firstdigitalcalculating machine that used vacuumtubes)ABEND Abnormal EndABI Application Binary InterfaceABIOS Advanced BIOSABIST Automatic Built-In Self-Test [IBM]ABLE Adaptive Battery Life Extender +Agent Building and LearningEnvironment [IBM]ABM Asynchronous Balanced ModeABR Available Bit RateABRD Automatic Baud Rate DetectionABRS Automated Book Request System[British Library]ABS Address Book Synchronization [IBM] +AbsoluteABT AbortABTS ASCII Block Terminal ServicesAC Autocheck + Automatic Computer +Alternating CurrentACAP Application Configuration AccessProtocolACC AccumulatorACCMAIL Accessing the Internet Via EmailACD Automatic Call DistributionACDI Asynchronous Communications DeviceInterfaceACE Access Control Encryption/Entry +Adobe Certified Expert +Advanced Composition Explorer[JHUAPL] +Advanced Computing Environment [SCO]+Adverse Channel Enhancements[Microcom] +* Automatic Computing EngineACF Access Control Field +Advanced Communications FunctionACH Automated Clearing HouseACIAS Automated Calibration IntervalAnalysis SystemACIS American Committee for InteroperableSystemsACK AcknowledgmentACL Access Control List + AsynchronousConnection-Less (link)ACM Association for Computing MachineryAudio Compression Manager [Microsoft]ACMS Application Control Management SystemACP Ancillary Control Program + AuxiliaryControl ProcessACPI Advanced Configuration and PowerInterfaceACR Allowed Cell RateACROSS Automated Cargo Release andOperationsService SystemACS Access + Access Control Set + AccessControl System +* Advanced Computer System [IBM] +Anti Curl System + AsynchronousCommunication ServerACSS Audio Cascading Style SheetsACTLU Active Logical UnitACTPU Active Physical UnitACTS Automated Computer Time ServiceACTT Advanced Communication andTimekeeping Technology [Seiko]ACU Automatic Calling UnitACVC Ada Compiler Validation CapacityA/D Analog to DigitalADA Automatic Data Acquisitions +(Programming Language named afterAugusta Ada Lovelace)ADB Apple Desktop BusADC Adaptive Data Compression (protocol)[Hayes] +Add with Carry + Analog to DigitalConverterADCCP Advanced Data Communication ControlProcedures/ProtocolADD Automatic Document Detection[WordPerfect]ADF Automatic Document Feeder +Automatically Defined Function.ADF Adapter Description File (file nameextension)ADI AutoCad/AutoDesk Device Interface(driver)ADIOS Automated Download and InstallationofOperating Systems [Queensland U.]ADL Address Data LatchADLAT Adaptive Lattice FilterADLC Adaptive Lossless Data Compression[IBM] +Asynchronous Data Link ControlADMACS Apple Document Management And ConrolSystemADMD Administrative Management Domain[X.400].ADN Add In Utility (file name extension)[Lotus 1-2-3] [LDC]ADO ActiveX Data ObjectsADP AOLserver Dynamic Pages + AutomaticData ProcessingADPCM Adaptive Differential Pulse CodeModulationADR AddressADS Application Development Solutions[AT&T] +Application Development System +Automatic Distribution SystemADSC Address Status Changed +Adobe Document StructuringConventions

ADSI Active Directory Service Interface Professionals[Microsoft] +AIT Advanced Intelligent Tape (drive)Analog Display Services Interface [Sony]ADSL (See DSL)AIX Advanced Interactive Executive [IBM]ADSP AppleTalk Datastream ProtocolAJAX Asynchronous JavaScript and XMLADSR Attack, Decay, Sustain, Release ALAT Advanced Load Address TableADT Abstract Data Type + Application Data ALC Arithmetic and Logic Circuits +TypesAutomatic Level ControlADU Automatic Dialing UnitALE Address Latch Enable +AE Above or EqualApplication Linking and EmbeddingAEB Analog Expansion Bus [Dialogic] ALGOL Algorithmic Oriented Language (seeAEC Architecture, Engineering,IAL)ConstructionALIBI Adaptive Location of InternetworkedAEM Asynchronous Event MechanismBases.AERO Aviation Industry (Domain Name)of Information[Internet]ALICE Artificial Linguistic InternetAES Advanced Encryption StandardComputer EntityAESA ATM End System AddressALINK Active Link [HTML]AF Auxiliary carry FlagALIWEB Archie Like Indexing in the WebAFA Accelerated File Access[Internet]AFC Antiferro-Magnetically Coupled ALM Asset Liability Management(media) [IBM] +ALN Asynchronous Learning NetworkAutomatic Font Change + Automatic ALOS Alternate Lighting Of SurfacesFrequency ControlALP Automatic Language ProcessingAFD Automatic File DistributionALR Advanced Logic Research, Inc.AFDW Active Framework for Data Warehousing ALT Alternate (mode)[Microsoft]ALT. Alternate lifestyle [USENET NewsgroupAFI Authority and Format Identifier Category]AFII Association for Font Information ALU Arithmetic Logic UnitInterchangeAM Amplitude ModulationAFIRM Automated Fingerprint Image Reporting AMA Automatic Message Accountingand MatchAMANDDA Automated Messaging and DirectoryAFIS Automated Fingerprint Identification AssistanceSystemAMASS Archival Management and Storage.AFM Adobe Font Metrics (file nameSystemextension) [Adobe Systems]AMD Active Matrix Display + AdvancedAFP Advanced Function Presentation [IBM] Micro Devices, Inc.+AMDD Agile Modelling Driven DevelopmentAdvanced Function Printing +AMI Alternate Mark Inversion + AmericanAppletalk Filing Protocol [Macintosh] Megatrends, Inc. +AFS Andrew File System (protocols)Application Messaging InterfaceAFTP Advanced/Anonymous File Transfer AMMA Advanced Memory ManagementProtocolArchitecture [Everex Systems]AGA Advanced Graphics AdapterAMPL Algebraic/Applied MathematicalAGC Automatic Gain ControlProgramming LanguageAGP Accelerated/Advanced Graphics Port AMPS Advanced Mobile Phone Service +AGRAS Antiglare-Antireflective-Antistatic AmplifiersAGU Address-Generation UnitAMR Audio Modem RiserAH Authentication Header (protocol) ANCOVA Analysis of CovarianceAHS Automated Highway SystemsANDF Architecture-Neutral DistributionAI Analog Input + ArtificialFormatIntelligenceANI Automatic Number IdentificationAIA Applications Integration Architecture .ANI Animated Cursor (file name extension)[DEC][Microsoft]AIC AIXwindows Interface Composer [IBM] ANN Artificial Neural NetworkAIFF Audio Interchange File Format.ANN Annotations (file name extension)AIIM Association for Information and Image [IBM]ManagementANOVA Analysis Of VarianceAIM AOL Instant MessengerANSI American National Standards InstituteAIN Advanced Intelligent Network [Bell ANX Automotive Network ExchangeAtlantic]AIO All-In-One[Chrysler/Ford/General Motors]AIP Application Infrastruture Provider AO Analog OutputAIR Architecture Implementation Review AOCE Apple Open Collaboration EnvironmentAIS Automated Identification System AO/DI Always On/Dynamic ISDN[NCIC] +AODV Ad Hoc On-Demand Distance VectorAutomated Information SystemsAOE Application Operating EnvironmentAISB Association of Imaging Service [AT&T]BureausAOL America OnlineAISP Association of Information Systems AOS Add Or Subtract

AP Adjunct Processor + Application [Internet]ProcessorA/P Accounts PayableARTTARQAsynchronous Remote Takeover TerminalAutomatic Repeat RequestAPA Adaptive Packet Assembly +All Points Addressable +Arithmetic Processing AcceleratorARUValueASAudio Response Unit + Average RetailAutonomous System [Internet]APAR Authorized Program Analysis Report ASAI Adjunct Switch Application Interface[IBM]APAREN Address Parity Enable [IBM][AT&T]ASAP As Soon As Possible +APCUG Association of PC User GroupsAutomatic Switching And ProcessingAPDU Application Protocol Data Units AS3AP ANSI SQL Standard Scalable andAPI Application Program InterfacePortableAPIC Advanced Programmable Interrupt ASB Advanced System Buffering [Intel]Controller (bus) [Intel].ASC ASCII text (file name extension)APIPA Automatic Private Interenet Protocol ASCC * Automatic Sequence ControlledAddressingCalculator [IBM]APIS Advanced Passenger Information System ASCII American Standard Code forAPL * A Programming Language (Mathematics) Information InterchangeAPM Advanced Power Management [IBM] ASD Application Structure DatabaseAPNIC Asia-Pacific Network Information [Microsoft] +Center [Internet]Automatic Skip Driver [Microsoft]APOP Authenticated Post Office Protocol ASF Active Streaming Format [Microsoft] +.APP Application (file name extension)Advanced Systems Format [Microsoft][R:Base]APPC Advanced Program-to-ProgramASICCircuitApplication-Specific IntegratedCommunications [IBM]ASIT Advanced Security and IdentificationAPPI Advanced Peer-to-Peer Internetworking TechnologyAPPLETS ApplicationsASL Adaptive Speed LevellingAPPN Advanced Peer-to-Peer Networking ASLM Apple Shared Library Manager[IBM][Macintosh]APPS Applications.ASM Assembler Source Language (file nameAPR Annual Percentage Rateextension)APRP Adaptive Pattern RecognitionASMP Asymmetric MultprocessingProcessingASN Abstract Syntax Notation + AutonomousAPS Active Pixel Sensor + Advanced Photo System NumberSystem +ASO Automated Systems OperationsAdvanced Printing Service [IBM] +Asynchronous Protocol SpecificationASP Active Server Page [Microsoft] +Application/Authorized ServiceAPSE ADA Programming Support Environment Provider +APT Address Pass Through +Advanced Parallel Technology +Automatically Programmed ToolsAspect Oriented Programming +Association of SharewareProfessionalsA/R Accounts Receivable.ASP Active Server Page (file nameARA AppleTalk Remote Accessextension)ARAG Antireflective-AntiglareASPI Advanced SCSI Programming InterfaceARAS Antireflective-Antistatic[Adaptec]ARC Acoustic Resonance ControlASPS Advanced Signal Processing System.ARC Archive (file name extension)ASRARCA Advanced RISC Computing ArchitectureARCnet Attached Resource Computer Network.ARJ Compressed File (file name extension)[Jung]ARL Adjusted Ring LengthARLL Advanced Run Length LimitedASTARM Advanced RISC Machine (processor) +Annotated Reference Manual +Asynchronous Response ModeAddress Space Register + AutomaticSend-Receive +Automatic Speech Recognition +Automatic System RecoveryASSP Anti-Spam SMTP Proxy +Application-Specific Standard ProductAST Research, Inc. (named from firstinitials ofthe founders: Albert Wong, SafiQureshey, Thomas Yuen)ARMA Association of Records Managers and AS/U Advanced Server for UnixAdministratorsASYNC AsynchronousARP Address Resolution Protocol [Novell] AS/400 Application System/400 [IBM]ARPANET Advanced Research Projects Agency AT Advanced Technology + AttentionNetworkARPL Adjust Requested Privilege LevelATA Advanced Technology Attachment +Analog Terminal AdapterARS Activity Reporting System [Unisys] ATAPI Advanced Technology Attachment PacketART Adaptive Resonance Theory (algorithm) InterfaceARTA Apple Real Time ArchitectureATC Advanced Transfer CacheARTIC A Real-Time Interface Coprocessor ATDP Attention Dial Pulse[IBM]ARTS Asynchronous Remote Takeover ServerATDTATEAttention Dial ToneAutomated Test Equipment.ARTS Cultural Groups (Domain Name)ATG Advanced Technology Group +

All-Terrain Grade [Dell].BAS Basic Language (file name extension)ATH Attention Hang-Up (Modem command) BASH Bourne Again Shell [Unix]ATL Active Template LibraryBASIC Beginner's All-purpose SymbolicATM Adobe Typeface Manager + Air Traffic Instruction CodeManagement +BASM Built-In AssemblerAsynchronous Transfer Mode +BAT Block Address TranslationAutomated Teller Machine.BAT Batch Processing (file nameATPS AppleTalk Printing Servicesextension)[Macintosh]B2B Business-To-BusinessATR Automatic Terminal Recognition BBS Bulletin Board SystemATS Administrative Terminal System + B2C Business To ConsumerApple Terminal ServicesBCC Block Check CharacterAT&T American Telephone and Telegraph BCC: Blind Carbon CopyATTN AttentionBCD Binary Coded DecimalATTRIB Attribute (also ATR)B-CHANNEL Bearer ChannelATX Advanced Technology Extended [Intel] BCL Base Class Libraries + Batch CommandATZ Attention Restore configuration Languageprofile fromBCN Beaconnonvolatile RAM (Modem command) BCNF Boyce-Codd Normal Form.AU Audio (file name extension)BCP Best Current Practice + Bulk CopyAUDIT Automated Data Input TerminalProgramAUI Attachment/Autonomous Unit Interface BCPL Basic Computer Programming LanguageAUP Acceptable Use Policy [Internet] BCR Byte Count RegisterAUTO AutomaticBCS Bar Code SorterAUTOEXEC Automatic ExecutionBDA Bios Data AreaAUX Auxiliary + (First Serial Port) BDC Backup Domain ControllerAV Audio/Video + Audio/Visual +BDE Borland Database Engine [Borland]Authenticity VerificationBDLS Bidirectional Loop SwitchingAVA Audio Visual Authoring [IBM]BDOS Basic Disk Operating SystemAVC Audio Visual Connection [IBM]BDR Bus Device RequestAVD Alternating Voice and DataBDSL (See DSL)AVG AverageBE Below or EqualAVI Audio Video Interleave [Microsoft] B2E Business To EmployeesAVL AVL Tree (named after its founders: BECN Backward Explicit CongestionAdelson, Veiskii and LandisNotificationAVP Attribute-Value PairBEDO Burst Extended Data OutAVR Automatic Voice RecognitionBEEP Blocks Extensible Exchange ProtocolAVS Advanced Visual SystemsBEL BellAVT Applied Voice TechnologyBELLCORE Bell Communications ResearchAVVID Architecture for Voice Video & BER Basic Encoding Rules + Bit Error RateIntegrated Data [Cisco]BERT Bit Error Rate Test/TesterAWE Advanced Wave Effects [Creative Lab] BF Bad FlagAWG American Wire GageB/F Background/ForegroundAWK (Unix language named after its .BFC Briefcase (file name extension)authors...[Microsoft]Al Aho, Peter Weinberger and Brian BFF Binary File Format [IBM]Kernighan)BFT Binary File TransferAWS Advanced Workstations and Systems BFTP Batch FTP(group) [IBM]BGA Ball Grid ArrayAWT Abstract Window Toolkit [Java] BGCOLOR Background Color [HTML]AX Architecture Extended + Automatic BGE Branch if Greater or EqualTransmission.BGI Borland Graphic Interface (file nameextension)BGP Border Gateway ProtocolBGT Branch if Greater ThanB...BHI Branch if HigherBHIS Branch if Higher or SameBHO Browser Helper Object [Spybot]| TOP | UP to A | DN to C | BOTTOM |BI Binary Input.BIB Bibliography (file name extension)BA Bell Atlantic (company)BiDi Bi-DirectionalBACP Bandwidth Allocation Control Protocol BIFET Bipolar Field Effect TransistorBAK Binary Adaptation Kit [Microsoft] BIFF Binary Interchange File Format.BAK Backup (file name extension)BIM Beginning of Information MarkerBAL Basic Assembly Language.BIN Binary (file name extension)BALUN Balanced Unbalanced (device)BINAC * Binary Automatic ComputerBAM Boyan Action ModuleBIND Berkeley Internet Name DomainBAPI Business Application Programming BINHEX Binary HexadecimalInterface [SAP]BIOS Basic Input/Output SystemBARTS Bell Atlantic Regional Timesharing BIS Business Information System

BISDN Broadband Integrated Services Digital BPL Branch If Plus + Broadband Over PowerNetworkLinesBIST Built-In Self-TestBPM Business Process ManagementBiSYNC (See BSYNC)[Microsoft]BIT Binary DigitBPP Bits Per PixelBITNET Because It's Time NetworkBPR Business Process Re-engineeringBITNIC Bitnet Network Information Center [Linux]BIU Bus Interface UnitBPS Bits Per Second + Bytes Per SecondBIW Business Intelligence Warehouse [SAP] BPSK Binary Phase Shift KeyingBIX Byte Information Exchange (BBS) BR Bad Register.BIZ Businesses (Domain Name) [Internet] BRGC Binary Reflected Gray Code.BK! Backup (file name extension)BRI Basic Rate Interface + Brain Response[WordPerfect]Interface.B~K Backup (file name extension)BS BackspaceBKSP BackspaceBSAM Basic Sequential Access MethodBL Backlit + Bit LineBSC Base Station Controller + BinaryBLAS Basic Linear Algebra Subroutines Synchronous CommunicationBLAST Bell Labs Layered Space Time + .BSC Boyan Script (file name extension)Blocked Asynchronous Transmission [Boyan Communications](protocol)BSCS Bachelor of Science (Degree) in[Communications Research Group] Computer Science.BLD BASIC Bload Graphics (file name BSD Berkely Software/Standardextension)DistributionBLE Branch if Less or EqualBSF Bit Scan ForwardBLER Block ErrorBSI British Standards InstituteBLI Business Logic IntegrationBSM Basic Storage Module [IBM][Microsoft]BSP Bulk Synchronous ParallelismBLK BlockBSR Bit Scan ReverseBLMC Buried Logic MacrocellBS-RAM Burst Static RAMBLOB Binary Large ObjectBSS Block Started by SymbolBLOG Web LogBST Binary Search TreeBLOS Branch if Lower Or SameBSY BusyBMI Branch if MinusBSYNC Binary Synchronous CommunicationsBMIC BusMaster Interface Controller (protocol)[Intel]BT Bit TestBMP Basic Mapping Support + BasicBTAM Basic Telecommunications AccessMultilingual Plane +Method [IBM]Batch Message Processing Program BTB Branch Target Buffer.BMP Bitmap (file name extension)BTC Bit Test and Complement[Paintbrush Format]BTI Business Type IdentifierBNC Bayonet Neill-Concelman (connector BTOA Binary To ASCIIused withBTP Batch Transfer Programcoaxial cable invented by Mr. Neill- BTR Bit Test and ResetConcelman) +BTS Base Transceiver Station + Bit TestBritish Naval Connectorand SetBNE Branch if Not EqualBU Branch UnitBNF Backus-Naur Form (also Backus-Normal BUBL Bulletin Board for Libraries [Janet]Form) [developed byBUF BufferJohn Backus and Peter Naur]BUS Broadcast and Unknown ServerBNS Backbone Network ServiceBVH Base Video HandlerBO Binary OutputBWM Block-Write ModeBOA Basic Object AdapterB2X Binary To Hexadecimal [REXX]BOB Break-out BoxBYTE Binary Element StringBOC Basic Operator ConsoleBOF Beginning Of FileBOM Basic Online Memory [IBM] + BeginningOf MessageC...BOND Bandwidth On DemandBOOTP Bootstrap Protocol [Internet]BOPS Billion Operations Per SecondBORPQU Borland Pro Quattro| TOP | UP to B | DN to D | BOTTOM |BORQU Borland QuattroCC Programming LanguageBOS Basic Operating System.C C source code (file name extension)BOT Beginning Of Table + Beginning of [C]Tape + RobotCA Certification Authority + CollisionBP Base PointerAvoidanceBPB BIOS Parameter BlockCAB Compressed Application BinaryBPDU Bridge Protocol Data Unit[Microsoft]Berkeley Packet Filter.CAB Cabinet (file name extension)BPI Bits Per Inch[Microsoft]

CACLS Command-Line Access Control Lists CAV Constant Angular Velocity[Microsoft]CAVE Computer Automatic VirtualCAD Computer Aided DesignEnvironmentCADD Computer Aided Design and Drafting CBC Cipher Block ChainingCADE Client/server Application Development CBCR Channel Byte Count RegisterEnvironmentCBDS Connectionless Broadband Data ServiceCAE Client Application Enabler + Common CBEMA Computer and Business EquipmentApplicationsEnvironment + Computer AidedEngineeringCBGACBIManufacturers AssociationCeramic Ball Grid ArrayComputer BasedCAEN Chemically Assembled Electronic Instruction\InstrumentationNanocomputerCBL Computer Based LearningCAEX Computer Aided Exploration.CBL COBOL source code (file nameCAG Column Address Generatorextension)CAI Computer Aided InstructionCBMS Computer-Based Mail SystemCAIRN Collaborative Advanced Interagency CBN Community Based NetworksResearch NetworkCBR Case Based Reasoning + Constant BitCAL Calendar + Client Access License + RateComputer Aided LearningCBT Computer Based TrainingCALS Computer-Aided Acquisition inCBW Convert Byte to WordLogistic SupportCBX Computer-Controlled Branch ExchangeCAM Common Access Method + Computer Aided CC Cluster ControllerManufacturing +Contents Addressable MemoryCC:CCDCarbon CopyCharged-Coupled DeviceCAN Cancel + Controller Area Network CCFT Cold Cathode Fluorescent TubeCANBUS Conroller Area Network BusCCI Common Client Interface + CopyCAP Carrierless Amplitude and Phase- Control InformationModulation +Central Arbitration Point +Communication Application Platform +CCIE[Cisco]CCITTCisco Certified Internetwork ExpertComite Consultatif InternationalCompetitive Access Provider +Computer Aided PublishingTelegraphique etTelephonique/ Consultative Committee.CAP Capture (file name extension)for InternationalCAPD Computing To Assist Persons WithTelegraph and TelephoneDisabilities [JohnsHopkins University]CCLCCMConnection/Cursor Control LanguageCorba Component Mode + CrystalCAPE Concurrent Art-to-Product Environment Configuration Manager [Microsoft]CAPS Capitals (Upper Case Letters) +Cassette Programming SystemCCNACCNPCisco Certified Network AssociateCisco Certified Network ProfessionalCAPTCHA Completely Automatic Public Turing CCP Certified Computing Professional +Test To TellComputers and Humans ApartCC/PPConsole Command ProcessorComposite Capabilities/PreferenceCAR Committed Access Rate [Cisco]ProfileCARL Colorado Alliance of ResearchLibraries [Internet]CART Computer-Assisted Radar TomographyCAS Column Address Select/Strobe +Communications ApplicationSpecification +Computer Aided StylingCASE Computer Aided Software EngineeringCASL Crosstalk Application ScriptingLanguage [DCA]CASS Computer Assisted Search ServiceCASSIS Classified and Search SupportInformation SystemCAT Computer Adaptive Test + ComputerAided Testing +Computer Aided Tomography +Computer Aided Transcription +Concatenate.CAT Catalog (file name extension)CATS Computer Assisted Training SystemCAT5E (Cat 5e) Category 5e (cables)CAT SCAN Computerized Axial Tomography ScanCATV Community Antenna Television (thiswas the originalname for what is now known as CableTV)CAUControlled Access UnitCCS Common Command Set + CommonCommunications Services +Common Communications Support +Continuous Composite Servo +Cryptographic Checksum.CCS Color Calibration System (file nameextension)CCSIS Coded Character Set IDCCSD Cellular Circuit-Switched DataCCTLD Country Code Top-Level DomainCD Carrier Detect + Change Directory +Collision Detection + Color Display +Compact DiskC/D Control DataC2D Character To Decimal [REXX]CDA Compound Document Architecture [DEC].CDA CD Audio-Track (file name extension)CDBT Compact Disk-Based TrainingCDC Connected Device Configuration +Control Data CorporationCD_CHRDY Card Channel Ready [IBM]CD-DA Compact Disk - Digital AudioCDDI Copper Distributed Data InterfaceCDE Common Desktop Environment + ComplexData EntryCD-E Compact Disk - ErasableCDF Channel Definition Format

.CDF Comma Delimited Format (file name CFR Computerized Facial Recognitionextension)CFS Caching/Common File SystemCDFS Compact Disc File System [Microsoft] CFV Call For Votes [Bitnet]CD+G Compact Disk plus GraphicsCG Control GateCD-I Compact Disk - InteractiveCGA Color Graphics AdapterCDIA Certified Document Imaging Architect CGE Common Graphics EnvironmentCDL Computer Design LanguageCGI Computer Generated Images + ComputerCDMA Code Division Multiple AccessGraphics InterfaceCDMF Commercial Data Masking Facility CGI-BIN Common Gateway Interface - Binary[IBM].CGM Computer Graphics Metafile (file nameCD-MO Compact Disk - Magneto Optical extension) +CDO Collaboration Data ObjectsGraph (file name extension) [Lotus 1-[Microsoft]2-3] [LDC]CDOS Concurrent Disk Operating System CGMS Copy Generation Management SystemCDP * Certificate In Data Processing (First CGS Continuous-Grain SiliconcertificationCHAP Challenge-Handshake Authenticationfor Computer Professionals)ProtocolCDPD Cellular Digital Packet DataCHAR CharacterCDR Call Detail Record + Call Detail CHAT Conversational Hypertext AccessRecording +Technology [Internet]Common Data RepresentationCHCK Channel Check.CDR CorelDRAW (file name extension) CHCP Change Code Page[Corel]CHDIR Change DirectoryCD-R Compact Disk - RecordableCHFN Change Finger [Unix]CD-RAM Cached RAMCHGRP Change GroupCD-RDX Compact Disk - Read Only Memory Data CHIPS Clearinghouse Interbank PaymentsExchange StandardSystemCDRL Contract Data Requirements List .CHK CHKDSK (file name extension)CD-ROM Compact Disk - Read Only Memory CHKDSK Check DiskCD-ROM-XA CD-ROM Extended ArchitectureCHMOD Change ModeCD-RTOS Compact Disk - Real Time Operating CHOWN Change OwnerSystemCHP ChapterCD-RW Compact Disk - RewritableCHR CharacterCDS Current Directory StructureCHRP Common Hardware Reference PlatformCDSA Common Data Security Architecture CHS Cylinder Head SectorCDSL (See DSL)CHTML Compact/Compressed HTML.CDT Corel Draw Template (file name CI Component Interfaceextension)CIA Current Instruction AddressCD-V Compact Disk - VideoCIAC Computer Incident Advisory CapabilityCD-WO Compact Disk - Write OnceCICS/VS Customer Information Control System/.CDX Compound Index (file name extension)Virtual Storage [IBM][Fox Pro]CD-XA Compact Disk - Extended ArchitectureCID Charge-Injection Device +Configuration/Installation/DistributiCE Cache Enable + Chip Enable +onCollision Elimination +CIDR Classless Inter-Domain RoutingConsumer Elecronics + Convert Enable CIF Common Interchange/IntermediateCEB Conditional End BracketFormat +CEC Certified E-Commerce ConsultantCrystallographic Information File +CEG Continuous Edge GraphicsCustomer Information FeedCEI Conducted ElectromagneticCIFS Common Internet File SystemInterferenceCIL Common Intermediate Language [ECMA]CELP Card Edge Low Profile (socket) CIM Common Information Model +[Intel]CEMS Constituent Electronic Mail SystemCompuServe Information Manager +Computer Integrated ManufacturingCEOP Conditional End Of PageCIO Chief Information OfficerCER Canonical Encoding RulesCIOCS Communication Input/Output ControlCERN The European Particle PhysicsSystemLaboratory (initialsCIP Command Interface Port + Commonoriginally from Conseil Europeen pour Indexing Protocolla RechercheCIR Committed Information RateNucleaire)CIRC Circular Reference +CERT Computer Emergency Response TeamCross-Interleaved Reed-Solomon CodeCFB Cipher Feedback + Configurable CIS Card Information Structure + ClientFunction BlockInformation System +CF Compact Flash (camera)CompuServe Information Service +.CFG Configuration (file name extension)Computer Information Systems +CFM Code Fragment Manager [Macintosh] +Cubic Feet Per MinuteContact Image Sensor +Customer Information SystemCFML ColdFusion Markup LanguageCISC Complex Instruction Set ComputingCFP Call For ProposalCIT Computer-Integrated Telephony

CIVR Computer and Interactive Voice CMM Capability Maturity ModelResponseCMMS Computerized Maintenance ManagementCIW Certified Internet WebmasterSoftwareCIX Commercial Internet Exchange + CMMU Cache/Memory Management UnitCompulink Information Exchange [Motorola]CJLI Command Job Language Interpreter CMOS Coats-Mellon OperationalCKD Count Key Data (device)Specification +CLAR Channel Local Address RegisterComplementary Metal-OxideCLASS Client Access to Systems and Services Semiconductor+CMOV Conditional MoveCooperative Library Agency for CMP Compare + ComputerSystems and Services +CMPS Compare Word StringCustom Local-Area Signaling Services CMS Call Management Server +CLC Clear Carry FlagCode Management System +CLD Clear Direction FlagCompiler Monitor System +CLDC Connected Limited DeviceContent Management System +ConfigurationConversation Monitor SystemCLEC Competitive Local Exchange Carrier CMTS Cable Modem Termination SystemCLI Call-Level Interface + ClearCMVC Configuration Management VersionInterrupt Flag +Control [IBM]Client Library Interface + Command CMW Compartmented Mode WorkstationLine Interface +CMY Cyan-Magenta-Yellow (color model)Common LanguageCMYK Cyan-Magenta-Yellow-Black (colorInfrastructure/Interfacemodel)CLIB C LibraryCNA Certified NetWare/NetworkCLID Calling Line IdentificationAdministratorCLIST Command ListCNAPS Co-Processing Node Architecture forCLK ClockParallel SystemsCLNP Connectionless Network Protocol CNC Computerized Numerical ControlCLOS Common Lisp Object SystemCNE Certified NetWare EngineerCLP Cell Loss Priority + Constraint Logic .CNF Configuration (file name extension)ProgrammingCNG Calling (tone).CLP Clipboard (file name extension) CNI Certified Novell Instructor [Novell][Microsoft]CNIDR Clearinghouse for NetworkedCLR Common Language Runtime [Microsoft] Information andCLS Clear Screen + Common LanguageDiscovery and Retrieval [Internet]SupportCNN Composite Network NodeCLSID Class IdentifierCNR Carrier to Noise Ratio +CLTP Connectionless Transport Protocol Communication Network RiserCLTS Clear Task Switch FlagCNSS Core Nodal Switching SubsystemCLTV Constant Linear Time Velocity[Internet]CLUI Command Line User InterfaceCNT Carbon NanotubeCLUT Color Look-Up Table.CNT Contents (file name extension)CLV Constant Linear VelocityCNV Conventional (pertaining to Memory)CM Centimeter + Control Mark +CNVT ConvertCorrective MaintenanceCNX Certified Network ExpertCMA Concert Multi-thread Architecture CO Central Office + Command Output +CMAK Connection Manager Administration Kit Convert Out[Microsoft]COAST Card On A Stick (module)CMC Common Mail Calls + Common Messaging COAX Coaxial CableCalls +COB Chip-On-BoardCommunication Management.COB COBOL source code (file nameConfiguration +extension)Complement Carry Flag +COBOL Common Business-oriented LanguageComputer-Mediated Communication[Internet](See HLL).COD Code List (file name extension)CMD Circuit Mode DataCODASYL * Conference on Data System Languages.CMD Command (file name extension)(Group thatCMF Creative Music Formatdesigned COBOL)CNIDR Clearinghouse for Network Information CODE Client-Server Open DevelopmentandEnvironmentDiscovery and Retrieval [Internet] CODEC Coder/Decoder +CMIP Common Management InformationCompression/DecompressionProtocolCOE Common Operating EnvironmentCMIS Common Management InformationCOEM Commercial Original EquipmentServices/SystemManufacturerCML Chemical Markup Language + Conceptual COFF Common Object File Format [Unix]Modelling Language +COGO Coordinate Geometry (ProgrammingComputer Managed Learning + CurrentMode LogicLanguage)COL Collision + Computer Oriented

Language.CPI Code Page Information (file nameCOLD Computer Output to Laser Diskextension) [MS-DOS]COLL CollisionCPI-C Common Programming Interface forCOM Component Object Model [Microsoft] + Communications [IBM]Computer Output MicrofilmCPIO Copy In and Out [Unix].COM Command (file name extension) +Commercial Business (Domain Name)CPL.CPLCurrent Privilege LevelControl Panel (file name extension)[Internet]CPLD Complex Programmable Logic DeviceCOM1 First serial Port (asynchronous port) CPM Critical Path Method + CryptographyCOM2 Second serial PortProvider ManagerCOM3 Third serial PortCP/M Control Program for MicrocomputersCOM4 Fourth serial Port[Digital Research]COMDEX Computer Dealers ExpositionCPO Chief Privacy OfficerCOMET Cornell Macintosh Terminal Emulator CPRM Content Protection for RecordableCOMM CommunicationsMediaCOMMAT In Morse Code (.--.-.)(dot dash dash CPS Certification Practice Statement +dot dash dot),Characters Per Second + Cycles Pername of the sign to denote theCommercial At symbol "@".SecondCPT Command Pass Through(Adopted by the ITU in December 2003) CPU Central Processing UnitCOMP CompareCPW Commercial Processing Workload [IBM]COMP. Computers [USENET Newsgroup Category] CR Carriage ReturnCOMSAT Communications Satellite CorporationCON Console (includes Keyboard andScreen)COND ConditionCONFIG ConfigurationCONS Connection-Oriented Network ServiceCONTONE Continuous Tone.COOP Cooperatives-Business (Domain Name)[Internet]COPICS Communications Oriented ProductionInformationand Control System [IBM]COR Common Object RuntimeCORBA Common Object Request BrokerArchitectureCOREN Corporation for Research andEnterprise NetworkCOS Compatible Operating System +Customer Order Specification[Kodak/Fuji]Education NetworkingCRF Cable Retransmission Facility + CrossReference FileCRI Color Reproduction IndicesCRISM Compact Reconnaissance ImagingSpectrometer for MarsCRISP C Reduced Instruction Set Processor[AT&T Bell Labs]CRL Certificate Revocation ListCR/LF Carriage Return/Line FeedCOSE Combined Office Standard Environment CRM Customer Relationship Management+CROM Control Read Only MemoryCommon Open Software/SystemsEnvironmentCRTCRTCCathode Ray TubeCRT ControllerCOSMIC Computer Software Management and CRUD Create, Retrieve, Update, DeleteInformationCenter [NASA]CSSegmentChip Select + Clear to Send + CodeCOSMOS Computer System for MainframeC/S Client/ServerOperationsCSA Calendaring and Scheduling API [IBM]COSS Common Object Services Specification CSAR Channel System Address RegisterCOTS Commercial Off-The-Shelf (software) CSCW Computer Supported Cooperative WorkCP Copy ProtectedCSD Circuit-Switched Data +CPA Certified Public Accountant + CostComputer Services Department +Per ActionCorrective Service Diskette [IBM]CPAN Comprehensive Perl Archive Network CSDS Circuit Switched Data ServiceCPC Constant Point Calculation + Cost Per CSE Certified System EngineerClickCSFI Communication Subsystem ForCPCS Check Processing Control System [IBM] InterconnectionCPE Central Processing Element +Customer Premises Equipment +Customer Provided EquipmentCSGCSIConstructive Solid Geometry +Consulting Services Group [Lotus]Code Sequence Identification +.CPE Cover Page (file name extension)Command Sequence Introducer +CPFR Collaborative Planning, Forecastingand ReplenishmentCPG Clock Pulse GeneratorCPI Characters Per Inch + Clock PerInstruction +Common Programming Interface [IBM]CRAM Challenge-Response AuthenticationMechanism +Cyberspatial Reality AdvancementMovementCRAYON Create Your Own NewspaperCRC Cyclic Redundancy Check.CRD Cardfile (file name extension) +Chord (music file name extension)CREN Computer Research Education Network +Corporation for Research andCompuServe IncorporatedCSID Called Subscriber IdentificationCSL Computer Sensitive LanguageCSLIP Compressed Serial Line InterfaceProtocol [Internet]CSM Code Set Map (file) + Communications

Services Manager +Control Strip Module [Macintosh]CSMA/CA Carrier Sense Multiple Access/withCollision AvoidanceCSMA/CD Carrier Sense Multiple Access/withCollision DetectionCSMS Customer Support Management SystemCSN Card-Select NumberCSNET Computer Science NetworkCSO Central Services OrganizationCSP Certified Systems Professional +Chip-Scale Packaging +Commercial Service Provider +Commercial Subroutine Package +CompuCom Speed Protocol [CompuCom] +Communicating Sequential Processes +Cross System Product [IBM]CSPDN Circuit Switched Public Data NetworkCSRAM Custom Static RAMCSS * Continuous System Simulator(Language)CSS Cascading Style Sheet [Microsoft] +Contact Start-Stop + ContentScrambling SystemCSSM Client-Server Systems Management[IBM]CS/SS Card Service/Socket ServiceCSTA Computer-Supported TelephonyApplicationsCSU Channel Service/Switching UnitCSV Circuit-Switched Voice +Comma-Separated Value/Variable +Common Services Verbs (interface)[Microsoft]C2T Cable Changing TechnologyC&T Chips and TechnologiesCTB Cipher Type ByteCTC Channel To Channel + Counter/TimerChipCTCP Client-To-Client ProtocolCTI Computer-Telephony IntegrationCTL Complex Text LayoutCTOS Cassette Tape Operating System +Computerized Tomography OperatingSystem +Convergent Technologies OperatingSystemCTP Community Technology Preview[Microsoft]CTPA Coax-to-Twisted-Pair AdapterCTRCO * Calculating,Tabulating,RecordingCompany (The name ofthis company was changed to"International BusinessMachines" by Thomas J. Watson, Sr.)CTRL ControlCTS Clear To Send + Computer TelephonySolution [IBM] +Customer Telephone SystemCTSS * Compatible Time Sharing SystemCUA Common User Access [IBM]CUB Cursor BackwardCUD Cursor DownCUE Custom Updates and Extras (card)[Egghead Software]CUF Cursor ForwardCUI Character-Oriented User Interface +Common User Interface [IBM]CUP Cursor PositionCUPID Completely Universal Processor I/ODesign [AST].CUR Cursor (file name extension)CUSIP Committee for Uniform SecurityIdentificationProcedures [U.S. Treasury]CUT Control Unit TerminalCUTE Clarkston University TerminalEmulatorCUU Cursor UpCVE Common Vulnerabilities and Exposures[US-CERT]CVF Compressed Volume FileCVGA Color Video Graphics ArrayCVIA Computer Virus Industry Association.CVR Cover Page (file name extension)CVS Computer Vision Syndrome + ConcurrentVersions SystemCVT ConvertCVW CodeView for WindowsCWA Competitive Web AnalysisCWD Convert Word to Double Word +Change Working Directory [Internet]CWIS Campus Wide InformationService/System [Internet] +Community Wide InformationService/System [Internet]C2X Character To Hexadecimal [REXX]CXML Commerce Extensible Markup LanguageCYL CylinderCYMK Cyan-Yellow-Magenta-Black (colormodel)D...| TOP | UP to C | DN to E | BOTTOM |D/A Digital to AnalogDAA Data Access Arrangement +Decimal Adjust for AdditionDAB Digital Audio BroadcastingDAC Data Acquisition and Control + DeviceAccess Code +Digital to Analog Converter +Dual Attachment ConcentratorDACL Discretionary Access Control ListDACTLU Deactive Logical UnitDAD Desktop Application Director[Borland]DAE Digital Audio ExtractionDAF Destination Address FieldDAI Distributed Artificial IntelligenceDAL Data Access Language [Apple Computer]+Data Access Layer + Disk AccessLockoutDAM Data Acquisition and MonitoringDAMA Demand Assigned Multiple AccessDAMPS Digital AMPSDAO Data Access Object [Microsoft] + DiskAt OnceDAP Data/Directory Access Protocol +Developer Assistance Program +Dynamic Application Partitioning[IBM]DAPIE Developers Application ProgrammingInterface ExtensionsDARI Database Application Remote Interface

[IBM]Control InterfaceDARMS Digital Alternate Realization of DCIM Duscrete Complex Image MethodMusical SymbolsDCL Data Control Language + Declaration +DART Digital Audio ReconstructionDEC Command Language [DEC] +TechnologyDevice Clear + Digital Control LogicDAS Decimal Adjust for Subtraction + +Dual-Attached StationDigital Command Language [Digital]DASD Direct Access Storage Device [IBM] DCML Dynamic Configuration Markup LanguageDAT Digital Audio Tape + Disk Array DCOM Distributed Component Object ModelTechnologyDCP Device Control Protocol +.DAT Data (file name extension)Digital Light Processing [TI]DATACOM Data CommunicationsDCS Data Collection System + Data ControlDAV Digital Audio-Video +Distributed Authoring and VersioningSystem +Desktop Color Separation +DAVIC Digital Audio-Visual CouncilDistributed Control SystemdB DecibelDCT Discrete Cosine TransformDB Data Base + Data Buffer + Device Bay .DCT Dictionary (file name extension)dBA Adjusted DecibelDCU Data-Cache Unit.dba Date Book Archive (file nameDD Day + Digital Display + Doubleextension) [Palm]DensityDBBS Dynamic Bass Boot SystemDDA Distributed Data Access + Domain-DBC Device Bay ControllerDefined AttributeDBCS Delivery Bar Code Sorter + Double- DDB Device Dependent Bitmap + DeviceByte Character SetDescriptor Block.DBF Database Format (file name extension) DDC Digital Data Channel [VESA] + DisplayDBIS Dun & Bradstreet Information Services Data Channel.DBK Docbook (format) (file nameDDCMP Digital Data Communications Messageextension)Protocol [DEC]dBm Decibels to a MilliwattDDC1 Display Data Channel OneDBM Data Base ManagerDDCS Distributed Database ConnectionDBMS Data Base Management SystemServices [IBM]DBR DOS Boot RecordDDD Direct Distance DialingDBS Data Base Server +DDE Direct Data Entry + Dynamic DataDirect (to home) BroadcastExchange [Microsoft](satellite) SystemDDEML Dynamic Data Exchange Manager LibraryDBV Digital Broadcast Video[Microsoft]DBWR Database Writer [Oracle]DDF Display Data Channel + Dynamic DataDB2 Database 2Formatting [IBM]DC Data Collection + Data Communication DDI Device Driver Interface ++ Data Control +Digital Document Interchange + DirectDevice Control + Direct Current Dial InD2C Decimal To Character [REXX]DDK Device Driver Kit [Microsoft Windows]DCA Digital Communications Associates + DDL Data Definition Language + DataDocument Content Architecture [IBM] Description LanguageDCAF Distributed Console Access Facility DDM Distributed Data Management[IBM]DCAM Digital Camera + Direct Chip AttachDDNDDNSDefense Data NetworkDynamic Domain Naming SystemModuleDCB Device Control Block + DiskDDOSDDPDistributed Denial Of ServiceDatagram Delivery Protocol +Coprocessor Board [Novell]Distributed Data ProcessingDCC Data Country Code + Digital Command DDR Dynamic Document Review [Symantec]Control +Digital Compact Cassette + DirectCable/Client Connection+ Display Combination CodeDCD Data Carrier DetectDCE Data Circuit-Terminating Equipment +Data Communications Equipment +Distributed Computing Environment[OSF] +Distributed Computing EquipmentDCED Distributed Computing EnvironmentDaemonDCF Data Communication Facility [IBM] +Data Compression Facility +Data Count Field [IBM] +Design Rule for Camera File Systems +Driver Configuration File [Lotus]D-CHANNEL Data ChannelDCI Digital Camera Images + DisplayDDR-SDRAM Double Data Rate-SDRAMDDS Data Description Specification +Digital Dataphone Service [AT&T] +Design Data Sheet +Digital Data Storage + Direct DigitalSynthesis +Distributed Database ServicesDDX Digital Data ExchangeDE Device EndDEA Data Encryption Algorithm +Disposable Email AddressDEC Decrement + Device Clear + DigitalEquipment CorporationDECNET Digital Equipment CorporationNetworking (protocol)DEF Desktop Functional Equivalent[Compaq].DEF Definitions + Defaults (file nameextensions)

DEFRAG DefragmentAssociation +DEK Data Encryption KeyDirect Inward System AccessDEL DeleteDISP Displacement (offset)DELSTR Delete String [REXX]DIST Digital Image Scaling Technology.DEM Demonstration (file name extension) DIT Directory Information TreeDEN Directory Enabled Network +DIV DivideDocument Enabled Networking [Novell- DIVE Direct Interface Video ExtensionXerox][OS/2 Warp]DEP Data Execution Protection [Microsoft] DIVX Digital Video ExpressDER Distinguished Encoding RulesDIW D-Inside Wire [AT&T]DES Data Encryption Standard + Data Entry DIX Digital-Intel-Xerox (OriginalSheetEthernet Standard).DES Description (file name extension) .DIZ Description In Zip (file nameDET Device Execute Triggerextension)DEV DeviceDL Download (also D/L)DF Data Field + Default + Destination DL/1 Data Manipulation Language 1 [IBM]Field +DLB Dynamic Load BalancingDevice Flag + Double FlagDLC Data Link Control (protocol) [IBM] +DFC Data Flow ControlDistributed Loop CarrierDFD Data Flow DiagramDLCI Data Link Connection IdentifierDFDR Digital Flight Data RecorderDLD Display List DriverDFM Design For Manufacturability [IBM] DLE Data Link EscapeDFP Digital Flat PanelDLL Dynamic Link LibraryDFS Distributed File SystemDLM Distributed Lock Manager + DynamicDFSMS Data Facility Storage Management Link ModuleSubsystem [IBM]DLP Digital Light ProcessingDFT Design For Testability + Diagnostic DLPI Data Link Provider InterfaceFunction Test +DLR DOS LAN RequesterDiscrete Fourier Transform +DLS Data Link Switching [IBM] +Distributed Function TerminalDownloadable SoundsDFU Data File UtilityDLT Digital Linear TapeDGIS Direct Graphics Interface Standard DM Distributed MemoryDHCP Dynamic Host Configuration Protocol DMA Direct Memory Access/Addressing +DHL Dynamic Head LoadingDocument Management Alliance.DHP Dr. Halo PIC (file name extension) DMAC DMA ControllerDHTML Dynamic HTMLDMACS Distributed Manufacturing AutomationDI Data In + Destination Index& Control SoftwareDIA Document Interchange Architecture DMD Digital Micromirror Device [TI][IBM]DIAD Delivery Information AcquisitionDME Direct Memory Execution +Distributed Management EnvironmentDevice [UPS]DMF Distribution Media Format [Microsoft]DIB Device Independent Bitmap +DMI Desktop Management InterfaceDirectory Information Base +Dual Independent Bus [Intel]DML Data Manipulation Language +Dialog Markup Language [W3C]DIBOL DEC Business Oriented Language DMM Digital Multimeter.DIC Dictionary (file name extension) DMMS Dynamic Memory Management SystemDICOM Digital Imaging and Communications in DMOS Double-diffused Metal-OxideMedicineSemiconductorDID Direct Inward DialingDMP Dot Matrix PrinterDIDS Distributed Intrusion Detection DMPC Distributed Memory Parallel ComputerSystemDMPP Distributed Memory Parallel ProcessorDIF Data Interchange FormatDMQS Display Mode Query and Set [IBM]DIFFSENS Differential SenseDMS Data Management Software +DIIP Direct Interrupt Identification Port Data/DocumentDILA Direct-Drive Image Light AmplifierManagement SystemDIME Direct Internet Message Encapsulation DMSD Digital Multistandard DecodingDIMM Dual In-Line Memory ModuleDMSDK Digital Media Software DevelopmentDIN Deutsche Industrie Norm (German Kit [SGI]equivalent of EIA)DMSS Distributed Mass Storage SystemDIO Data Input-OutputDMT Digital/Discrete Multi-ToneDIP Dialup Internet Protocol [Internet] + DMTF Desktop Management Task ForceDigital Imaging Processing +DMY Day Month YearDual In-line Package + Dual In-line DMZ Demilitarized ZonePinDN DownDIR Directory (file)DNA Deoxyribonucleic AcidDIS Distributed Interactive Simulation + DNC Direct Numerical ControlDraft International Standard + DNIC Data Network Identification CodeDynamic Impedance Stabilization DNIE Digital Natural Image Engine[CompuCom]DNIS Dialed Number Identification ServiceDISA Data Interchange StandardsDNS Domain Naming System

DO Data Out + Distributed Objects DRO Data Request Output + DestructiveDOA Dead On ArrivalRead-Out.DOC Document + Documentation (file name DRS Document Registration Systemextensions).DRS Driver Resource (file name extension)DOCSIS Data Over Cable-Service Interface [WordPerfect]SpecificationDRV DriveDOCSV Data Over Circuit-Switched Voice .DRV Device Driver (file name extension)DOE Distributed Objects(Also see .DVR)Environment/Everywhere.DRW Draw + Drawing (file name extensions)DOIP Dial Other Internet Providers [IBM] DS Data Segment + Data Send + DataDO-IT Disabilities, Opportunities,Server + Double SidedInternetworking andD/S Dhrystone Per SecondTechnologyDS3 Digital Signal Level 3DOLAP Desktop OLAPDSA Digital Signature Algorithm +DOM Document Object Model [W3C]Directory System AgentDOMF Distributed Object ManagementDSAP Destination Service Access PointFacilityDSD Direct Stream Digital [Sony-Philips]DOS Denial Of Service + Disk Operating DSDD Double Sided, Double DensitySystem(diskette)DOSEM DOS EmulationDSE Data Storage Equipment.DOT Document Template (file nameDSEA Display Station Emulation Adapterextension)DSECT Dummy Control SectionDOV Data Over VoiceDSHD Double Sided, High Density (diskette)DOW Day Of WeekDSIG Digital SignatureDP Data Processing + Dot PitchDSIS Distributed Support InformationDPA Demand Protocol Architecture [3Com] + StandardDocument Printing Architecture DSL Digital Subscriber LineDPAM Demand Priority Access MethodADSL Asymmetric DSLDPAREN Data Parity Enable [IBM]BDSL Broadband DSLDPB Drive Parameter BlockCDSL Consumer DSL [Rockwell]DPC Direct Program ControlFDSL Fixed DirectoryDPI Distributed Protocol Interface + Dots Subscriber ListPer InchDPL Dedicated Public License +HDSL High-Bit-Rate DSL +High-Data-Rate DSLDescriptor Privilege LevelIDSL Integrated ServicesDPM Digital Panel MeterDigital Network DSLDPMA Data Processing ManagementRDSL Rate-Adaptive DSLAssociationSDSL Single-Line DSL +DPMI DOS Protected Mode InterfaceSymmetric DSL[Microsoft]VDSL Very-High-Bit-Rate DSLDPMS Digital Power Management Signaling +VADSL Very-High-RateDisplay Power Management Support Asymmetric DSLDPO Data Phase OptimizationVDSL Very-High-Data-Rate DSLDPOF Digital Print Order FormatDSL Domain Specific Language + DynamicDPS Document Processing SystemSimulation LanguageDPSK Differential Phase Shift Keying DSLAM Digital Subscriber Line AccessDPtoTP Display Coordinates to TabletMultiplexerCoordinatesD-SLR Digital Single Lens Reflex (camera)(converting)DSM Distributed Shared Memory +DQDB Distributed Queue Dual BusDomain-Specific ModelingDQL Data Query LanguageDSMA Digital Sense Multiple AccessDR Data ReceivedDSML Directory Services Markup LanguageD/R Direct or ReverseDSN Data Source Name + Delivery ServiceDRAM Dynamic Random Access MemoryNotificationDRAW Direct Read After WriteDSO Dynamic Shared ObjectDR.BOND Dial-up Router Bandwidth On Demand DSOM Distributed System Object Model[NEC]DRCMF Digital Reality Creation MultiDSP Delivery Service Partner +Digital Signal Processing/Processor +Function [Sony]Digital Sound Processor +DRDA Distributed Relational DatabaseDirectory Synchronization ProtocolAlgorithm/Architecture [IBM][Lotus]DR-DOS Digital Research-Disk Operating DSPT Display Station Pass-Thru [IBM]SystemDSQD Double Sided, Quad Density (diskette)DRDW Direct Read During WriteDSR Data Set Ready + Device StatusDRE Direct Recording Electronic (voting Register +systems)Device Status ReportDRI Declarative Referential Integrity + DSS Decision Support System + DigitalDigital Research IncorporatedSignature Standard +DRM Digital Rights/Distributed ResourceDigital Spread Spectrum + DirectManagementStation Selector

DSSA Domain Specific Software Architecture DVR Digital Video/Voice RecorderDSSI Digital Standard Systems Interconnect .DVR Device Driver (file name extension)[DEC](Also see .DRV)DSSS Direct-Sequencing Spread Spectrum DW Data WarehousingDSSSL Document Style Semantics andDWDM Dense Wavelength Division MultiplexerSpecifications LanguageDWG DrawingDSTN Double Supertwisted NematicDWMT Discrete Wavelet MultitoneDSU Data Service/Switching Unit + Digital DWT Discrete Wavelet TransformService UnitD2X Decimal To Hexadecimal [REXX]DSVD Digital Simultaneous Voice and Data .DXB Drawing Interchange Binary (file nameDSW Data Status Word + Device Status Word extension)DSX Digital Signals Cross-Connect[AutoCAD]D2T2 Dye Diffusion Thermal Transfer DXC Data Exchange Control(printing)DXF Data Exchange File + Drawing ExchangeDTA Digital Terminal Adapter + Disk FormatTransfer AreaDXI Data Exchange Interface.DTA Data (file name extension)DYNSLT Dynamic Select [IBM]DTC Desktop ConferencingDYNSRC Dynamic SourceDTCP Digital Transmission Copy Protection[Hitachi, Intel, Panasonic, Sony,Toshiba]DTD Document Type DefinitionDTE Data Terminal Equipment + DumbE...Terminal EmulatorDTF Distributed Test FacilityDTL Dialogue Tag Language [IBM] + Diode-| TOP | UP to D | DN to F | BOTTOM |Transistor LogicEA Effective Address + ExtendedDTM Digital Terrain MappingAttribute [OS/2]DTMF Data Tone Multiple Frequency + Dual EAI Enterprise Application IntegrationTone MultifrequencyEAP Extensible Authentification ProtocolDTP Desktop Publishing + Distributed EAR Enterprise Archive + External AccessTransaction ProcessRegisterDTR Data Terminal Ready + Data Transfer EARN European Academic Research NetworkRateEAROM Electrically Alterable Read OnlyDTS Digital Theatre Systems + Digital MemoryTransceiving SystemEARS Electronic Access to ReferenceDistributed Traffic Shaping [Cisco] Services +DTSS Dartmouth Time Sharing SystemElectronic Authoring and RoutingDTV Desktop Video + Digital Television System [DEC] +DTVC Desktop Video ConferencingExplicit Archive and Retrieval SystemDU Disk Usage[Langley Research]DUA Directory User AgentEATA Enhanced AT Bus AttachmentDUAT Direct User Access TerminalEAX Environmental Audio ExtensionsDUN Dial-Up Networking [Microsoft] [Creative]DUNCE Dial Up Network ConnectionEB Exabyte (1,024 petabytes)Enhancement(One Billion Billion characters ofDV Digital Videoinformation).DV DESQview Script (file name extension) EBASIC Extended BASICDVC Desktop Video Conferencing + Digital EBC EISA Bus ControllerVideo Camera +EBCT Electron Beam Computed TomographyDigital Video Cassette + Dual Voice EBCDIC Extended Binary Coded DecimalCoilInterchange Code [IBM]DVD Digital Video DiskEBI Equivalent Background Input +DVD-A Digital Video Disk-AudioExtended Background InvestigationDVD-AR Digital Video Disk-Audio Recording EBNF Extended Backus-Naur FormDVD-R Digital Video Disk-RecordableEBOOK Electronic BookDVD-RAM Digital Versatile Disc-RAMEBPP Electric Bill Presentment and PaymentDVD-ROM Digital Versatile Disc-ROMEBR Extended Boot RecordDVD-SR Digital Video Disk-Stream Recording EBS Event-Based SamplingDVD-VR Digital Video Disk-Video Recording EBT Electronic Benefits TransferDVE Digital Video EffectEBXM Electronic Business XMLDVI Digital Video Interactive + Digital EC Electronic Commerce + Error ControlVisual InterfaceECAL Enjoy Computing And Learn.DVI Device Independent (file nameECAT Electronic Card Assembly and Testextension)[IBM]DVM Digital Video Manager + Digital Volt ECB Electronic Codebook + Event ControlMeterBlockDVMRP Distance Vector Multicast Routing ECC Elliptic Curve Crypto + Error CheckProtocol [Internet]Code +DVOF Digital Video Over FiberError Checking and Correction + Error

Correction CodeSpecificationECD Enhanced Color Display + Enhanced EEPI Electronic Entertainment PolicyCompact DiskInitiativeECDL European Computer Driving Licence EEPROM Electrically Erasable ProgrammableECHO European Commission Host Organization Read-Only Memory[Internet]EES Escrow Encryption StandardECI External Call InterfaceEFA Extended File AttributeECL Emitter Coupled LogicEFF Electronic Frontier FoundationECM Electronic Control ModuleEFI Electromechanical FrequencyECMA European Computer Manufacturers Interference +AssociationElectronics For Imaging +ECN Electronic Communications NetworkExtensible Firmware InterfaceECNE Enterprise Certified NetWare Engineer EFIGS English, French, Italian, German,[Novell]SpanishECP Enhanced/Extended Capabilities Port EFL Emitter Follower Logic[Microsoft]E-FORM Electronic FormECS Enhanced Chip SetEFS Encrypting File SystemECTL Electronic Communal Temporal Lobe EFTS Electronic Funds Transfer SystemECU EISA Configuration UtilityEGA Enhanced Graphics AdapterED Erase DisplayEGP Exterior Gateway ProtocolEDA Electronic Design Automation + EGREP Extended Global Regular ExpressionEmbedded Document Architecture [Go Print [Unix]Corporation]EHCI Enhanced Host Controller InterfaceEDB Embedded DatabaseEHLLAPI Emulator High Level LanguageEDC Electronic Digital Computer +Enhanced Data Correction +ApplicationProgramming Interface [IBM]Error Detection and Correction EIA Electronic Industries AssociationEDDC Extended Distance Data CableEICAS Engine Indicating and Crew AlertingEDE Encrypt-Decrypt-EncryptSystemEDG Electronic Program GuideEIDE Enhanced Integrated Drive ElectronicsEDGAR Electronic Data Gathering, Analysis EIM Electronic Image Managementand RetrievalEIS Enterprise/Executive InformationEDGE Enhanced Data-Rates for Global SystemEvolutionEISA Extended Industry StandardEDI Electronic Data Interchange +ArchitectureElectronic Document Interchange [DEC] EJB Enterprise JavaBeansEDIF Electronic Design Interchange Format EL Electroluminescent (display) + EraseEDIFACT EDI for Administration Commerce and LineTransportEDL Edit Decision ListELANELCEmulated Local Area NetworkEmbedded Linking and ControlEDLC Ethernet Data Link ControlELD Electronic License DistributionEDLIN Editor (Line Text)ELEC Enterprise Local Exchange CarrierEDMS Electronic Document Management System ELF Executable and Linking Format +EDO Extended Data OutExtremely Low FrequencyEDOS Enhanced DOS for WindowsELOS Embedded-Objects Linked AcrossEDP Electronic Data ProcessingSystemsEDPM Electronic Data Processing Machine ELPH Entr Level PowerShot [Canon]EDR Enhanced Data RateELS Entry Level SystemEDRAM Enhanced/Eraseable/Extended Dynamic EM Electronic Mail + Emphasized + End ofRandom Access MemoryMedium +EDS Electronic Data Systems (corporation)Expanded MemoryEDSAC * Electronic Delay Storage Automatic EMA Electronic Mail Association +CalculatorEnterprise Management/MemoryEDTV Enhanced Definition Television Architecture.EDU Educational Institutions (Domain EMACS Editing Macros [Unix]Name) [Internet]E-MAIL Electronic MailEDVAC * Electronic Discrete VariableEMB Extended Memory Block [LIM/AST]Automatic ComputerEMBARC Electronic Mail Broadcast to a(First stored-program digitalRoaming Computercomputer)EE Extended Edition [IBM]EMC[Motorola]Electromagnetic Compatibility +EEC Extended Error CorrectionEnhanced Memory Chip +EEDID Enhanced-Extended DisplayE-Mail Connection + Extended MathIdentification DataCoprocessorEEGEELEEMEEMACof CanadaEEMSElectroencephalogramEMCCEpsilon Extension LanguageExtended Memory ManagementElectrical & Electronic ManufacturersEnhanced Expanded Memory* Eckert-Mauchly Computer Company(World's first computercompany, founded by Presper Eckartand John Mauchly,who invented and built the firstUNIVAC)

EMF Extended Metafile Format [Microsoft] ERAS Electronic Routing and ApprovalEMI Electromagnetic InterferenceSystem [Hughes Aircraft].EML Electronic Mail (file name extension) ERD Emergency Repair Disk + EntityEMM Expanded Memory ManagerRelationship DiagramEMP Electro-Magnetic PulseERIC Educational Resources InformationEMR Electro-Magnetic Radiation +Center [Internet]Enhanced Metafile RecordERLL Enhanced Run Length LimitedEMS Electronic Mail System +ERMA * Electronic Recording Method,Electronic Message Service +Energy Management System +Accounting[General Electric]Enhanced Messaging Service +Expanded Memory Specification [LIM]EROMEROSErasable Read Only MemoryEarth Resources Observation SystemEMSAPI Extended Messaging Services[U.S. Geological Survey]ApplicationProgramming InterfaceERP Effective Radiated Power +Enterprise Resource PlanningEMWAC European Microsoft Windows NTERR ErrorAcademic CentreER/RC Extended Result/Response Code.ENC Encoded (file name extension)ERU Emergency Recovery UtilityENDEC Encoder/Decoder[Microsoft]ENDS Ends SegmentES Extra SegmentENIAC * Electronic Numerical Integrator ESA Enterprise Systems Architecture [IBM]Analyzer and+Computer (First fully electronicdigital computer)ESBEuropean Space AgencyEnterprise Service BusENQ EnquiryESC EISA System Component + EscapeENSS Exterior Nodal Switching Subsystem ESCD Extended System Configuration Data[Internet]ESCM Extended Services CommunicationsEOA End Of AddressManager [IBM]EOB End Of BlockESCO Extemded Synchronous ConnectionsEOC End Of ConversionESCON Enterprise System ConnectionEOF End Of File + Enterprise Objects (Architecture) [IBM]FrameworkESC/P Epson Standard Code for Printers[Next Computer]ESD Electronic Software Distribution +EOI End Of Interrupt + End Or IdentifyElectrostatic Discharge + EmergencyEOJ End Of JobStartup DiskEOL End Of Line + End Of ListESDI Enhanced Small/System DeviceEOM End Of MessageInterfaceEOR Exclusive OR (Also XOR)ESDRAM Enhanced SDRAMEOS Earth Observing System [NASA] +Electro-Optical System [Canon] +ESFESIExtended SuperframeEnd System Identifier +End Of String + Error Correction CodeEnhanced Serial Interfaceon SIMM(specification) [Hayes]EOSDIS Earth Observing System Data and ESMR Enhanced Specialized Mobile RadioInformation System [NASA]ESMTP Extended Simple Mail TransferEOT Embedded Open Type (format)[Microsoft] +End Of Table + End Of Tape (marker) +End Of Text +End Of TransmissionEP Electrophotographic EngineEPC Electronic Product CodeEPIC Explicitly Parallel InstructionComputing (chip) [Intel]EPG Electronic Program GuideEPL Effective Privilege LevelEPLD Electrically Programmable LogicDeviceEPM Enhanced Editor for PresentationManager [IBM] +Enterprise Process Management [IBM]EPP Enhanced Parallel PortEPROCESS Executive ProcessEPROM Electrically Programmable Read OnlyMemory +Erasable Programmable Read OnlyMemory.EPS Encapsulated PostScript (file nameextension)EPSF Encapsulated PostScript FilesERA Extended Registry AttributesProtocolESN Electronic Security/Serial NumberESP Emulation Sensing Processor +Encapsulating Security Payload(header) +Enhanced Serial Port [Hayes] +Enhanced Service Provider +Enterprise System Platcorm +Estimated Selling Price +Eudora Sharing Protocol [Qualcomm]ESR Event Service RoutineESS Electronic Switching SystemESSENCE Electronic Surveillance System forthe Early Notificationof Community-Based Epidemics [JohnsHopkins University]ESSID Extended Service Set IdentifierESU Electro-Static UnitET Enhancement TechnologyETACS Extended Total Access CommunicationSystem [IBM]ETANN Electrically Trainable Analog NeuralNetwork (chip) [Intel]ETB End of Transmission BlockETC Electronic Toll Collection +Enhanced Throughput Cellular (modem

protocol) [AT&T]FCL Fibre Channel LoopE-TEXT Electronic TextFCPGA Flip Chip Pin Grid Array [Intel]ETF Enriched Text FormatFCR FIFO Control RegisterETOM Electron-Trapping Optical Memory FCRAM Fast-Cycle RAMETPL Endorsed Tempest Products List FCS Fiber Channel Standard + Frame CheckETS Econometric Time SeriesSequenceETX End Of TextFD Floppy Disk + Floppy Drive + FullEU Execution UnitDuplex.EU European Union (Domain Name)FDC Floppy Disk Controller[Internet]FDDI Fiber Digital Device Interface +EUC End-User Computing + Extended UnixFiber Distributed Data InterfaceCode [IBM]FDHD Floppy Drive High DensityEUDC End-User Defined CharacterFDIR Fault Detection, Isolation andEUDORA (Named after author of story:Recovery"Why I Live at the P.O.", Ms. Eudora FDISK Fixed DiskWelty)FDM Frequency Division MultiplexingEUI End-User InterfaceFDMA Frequency Division Multiple AccessEULA End-User License AgreementFDSL (See DSL)EUVL Extreme Ultraviolet Lithography FDX Full DuplexEVDO Evolution Data Only/OptimizedFEC Forward Error CorrectionEVE Extensible VAX EditorFECN Forward Explicit CongestionEVGA Extended Video Graphics Array + NotificationExtended Video Graphics Adapter FED Field Emission/Emitter DisplayEWAN Emulator Without A Good NameFEFO First-Ended, First-Out[Internet]FEP Front End ProcessorEWS Employee Written Software [IBM] FEPI Front End Programming InterfaceEWTS Enterprise Web Training System FEPROM Flash EPROMEXCA Exchangeable Card Architecture FERAM Ferroelectric RAM[Intel]FESDK Far East Software Development Kit.EXE Executable (file name extension) [Microsoft]EXE2BIN Program used to convert an (.EXE) FET Field Effect Transistorfile to binaryFF Flip-Flop + Form Feedformat (.COM) fileFFD Full Funtion DeviceEXIF Exchangeable Image File Format FFDC First Failure Data Capture [IBM]EXM Enterprise Messaging Exchange [Lotus] FFS Fast File SystemEXP ExponentFFST First Failure Support TechnologyEXT External[IBM]EXTRN External ReferenceFFT Fast Fourier Transform + Final FormE-ZINE Electronic MagazineText [IBM]FG Floating GateFGREP Fixed Global Regular Expression Print[Unix]F...FHS Fan Heat-SinkFHSS Frequency-Hopping Spread SpectrumFIA File Integrity Assessment| TOP | UP to E | DN to G | BOTTOM |FIB Forwarding Information BaseFIF Fractal Image FormatFAB Computer-Chip Fabrication Plant FIFO First-In, First-OutFAC File Access CodeFILO First-In, Last-OutFAMOS Floating Gate Avalanche MOSFINDSTR Find StringsFANS Future Air Navigation SystemFIOS (FiOS) Fiber Optic Services [Verizon]FAP File Access ProtocolFIP File Processor BufferingFAPI Family Application Program Interface FIPS Federal Information ProcessingFAQ Frequently Asked QuestionStandardFARNET Federation of American Research FIR Fast Infrared + Finite ImpulseNetworks [Internet]ResponseFASIC Function and Algorithm-Specific .FIRM Business or Firm (Domain Name)Integrated Circuit[Internet]FAT File Allocation TableFIRST Forum of Incident Response andFAX FacsimileSecurity Teams.FAX Fax (file name extension)FITS Flexible Image Transport SystemFBC Find By ContentFIU Fingerprint Identification UnitFC/AL Fiber Channel/Arbitrated Loop[Sony]FCB File Control BlockFIX Federal Internet ExchangeFCC Federal Communications Commission FK Foreign KeyFCC: File Carbon CopyFLA Four Letter AcronymFCCSET Federal Coordinating Council for FLC Ferro-electric Liquid CrystalScience, Engineering and Technology FLD FieldFC/EL Fiber Channel/Enhanced LoopFLIR Forward Looking Infrared (system)FCI Flux Changes per InchFLL FoxPro Link Library [Microsoft Fox

Pro]F/T Full TimeFLOPS Floating Point Operations Per Second FTAM File Transfer, Access and Management.FLR Folder (file name extension)+FLV Flash VideoFile Transfer and Access MethodFM Frequency ModulationFTL Flash Transition Layer [Intel]FMD Fluorescent Multilayer DiskFTM Flat Tension Mask [Zenith]FMRI Functional Magnetic Resonance Imaging FTP File Transfer Protocol [Internet]FMS Forms Management SystemFTPD File Transfer Protocol DaemonFMT FormatFTTB Fiber To The BasementFMV Full Motion VideoFTTC Fiber To The CurbFNT FontFTTN Fiber To The NeighborhoodFOCUS Forum of Control Data UsersFTS Federal Telecommunication SystemFOD Fax On DemandFTX Fault Tolerant UnixFOG First Osborne GroupFUI File Update InformationFOIP Fax Over Internet ProtocolFUNC FunctionFOIRL Fiber Optic Inter Repeater Link FUS Fast User Switching[IEEE]FUSE Far Ultraviolet SpectroscopicFOLDOC Free On-Line Dictionary Of Computing Explorer [JHUAPL]FOM Fiber Optics ModemFVT Full Video Translation.FON Font + Phone + Phone Directory (all FWTK Firewall Toolkitfile nameFXP File Exchange Protocolextensions)FYI For Your Information.FOR Fortran source code (file nameextension)FORTH (Programming Language)(See HLL)FORTRAN Formula Translator (ProgrammingLanguage)(See HLL)G...FOSE Federal Office Systems ExpositionFOSI Format Option Specification InstanceFOSSIL Fido/Opus/Seadog Standard Interface| TOP | UP to F | DN to H | BOTTOM |LayerGA General AvailabilityFPC Flexible Printed Circuit +GAAP Generally Accepted AccountingFloating Point CalculationPrinciplesFPCE Floating-Point C ExtensionGAC Global Assembly Cache(specification)GAL Generic Array LogicFPGA Field Programmable Gate-ArrayGAMS General Algebraic Mathematical SystemFPLA Field Programmable Logic-Array GAPI Gateway Application ProgrammingFPM Fast Page ModeInterfaceFPP Fixed Path Protocol + Floating Point GART Graphics Address Relocation TableProcessorGATT Graphics Address Translation TableFPR Floating-Point RegisterGAWD Global Access Wireless DatabaseFPS Favorite Picture Selection + Frames Gb Gigabit (1,024 megabits) +Per Second(One Billion Bits of Information)FPT Forced Perfect TerminationGB Gigabyte (1,024 megabytes) +FPU Floating Point Unit(One Billion Characters ofFPX FlashPix (format) [Kodak]Information)FQDN Fully Qualified Domain NameGCC GNU C-Compiler [Unix][Internet]GCCD Glass-Passivated Ceramic Chip DiodeFRAD Frame Relay Access Device +GCR Group Code RecordingFrame Relay Assembler/Disassembler GDA Global Data Area + GNOME Data AccessFRAG Fragment + FragmentationGDB GNU DebuggerFRAM Ferroelectric Random-Access Memory GDDM Graphics Data Display ManagerFRC Functional Redundancy Checking GDG Generation Data Group [IBM]FRED Frame Editor + Front-End to Dish GDI Graphical Device InterfaceFRMR Frame RejectGDLC Generic Data Link Control [IBM]FRPI Flux Reversals Per InchGDP Graphic Draw PrimitiveFRS Family Radio ServiceGDR Gas Discharge Arrestor.FRS WordPerfect Graphics Driver (file GDT Geometric Dimensioning andname extension)Tolerancing +FS File SeparatorGlobal Descriptor Table +FSB Front Side BusGraphics Development ToolkitFSD File System Driver [OS/2]GECOS General Electric ComprehensiveFSE Full Screen EditorOperating SystemFSF Free Software Foundation [Internet] GEIS General Electric Information ServiceFSK Frequency Shift Keying(company)FSN Full Service NetworkGEM Graphics Environment Manager (DRIFSO Free Space OpticsProgram)FSP File Service ProtocolGENIE General Electric Network forFSR Free System ResourcesInformation ExchangeFST Flat Square Tube (monitor)GEO Geostationary Earth Orbit

GEOS Global Entity Ordering System + GRADD Graphics Adapter Device Driver [IBM]GEOS Graphic Environment Operating System GRE Generic Routing Encapsulation +[Geoworks]Graphics EngineGET Get Execute TriggerGREP Global Regular Expression PrintGFDL GNU Free Documentation License .GRF Graph (file name extension)GFI General Format Identifier + Ground- .GRP Group (file name extension)Fault InterceptorGS Group SeparatorGGP Gateway-Gateway Protocol [Internet] GSI General Server InterfaceGHZ GigahertzGSM Global Shared Memory +.GID Topics (file name extension)Global System for Mobile-[Microsoft]Communications (network).GIF Graphics Interchange Format (file GSNW Gateway Service for NetWarename extension)[Microsoft]GIG-E Gigabit EthernetGSP Generic Server Passer + GlobalGIGO Garbage In, Garbage OutService ProviderGII Global Information Infrastructure GSR Gigabit Switch RouterGILS Government Information Locator GSTN General Switched Telephone NetworkServiceGTE General Telephone ElectronicsGIMP GNU Image Manipulation Program (corporation)GIMPS Great Internet Mersenne Prime Search GTF Generalized Timing FormatGINA Graphical Identification andGTL Graphic Template Library +AuthenticationGunning Transceiver LogicGIS Geographic Information System + GTO Guide To Operations [IBM]Global Information Solutions [AT&T] GTP * Geometry Theorem ProverGIX Global Internet Exchange [Internet] GTS Generic Traffic Shaping [Cisco]GKS Graphical Kernel SystemGUI Graphical User InterfaceGL Graphics LanguageGUID Globally Unique Identifier +G/L General LedgerGlobal Universal IdentifierGLIS Global Land Information System [US GVT Global Virtual TimeGeological Survey]GW-BASIC Gee Whiz BASICGLL Geograpic Position-Latitude/Longitude GWES Graphic, Windowing and EventGLM General Linear ModelsSubsystemGLOBE Global Learning by Observations to .gz Compressed file (compressed filenameBenefitextension -the Environment [Internet]using GNU gzip.GLY Glossary (file name extension) compression/decompression program) [Unix][Microsoft Word]GZIP GNU ZipGMDI Gigabit Media-Dependent InterfaceGML Generalized Markup LanguageGMP Global Mobile ProfessionalGMR Giant Magneto-Resistive (read headtechnology)H...GMRS General Mobile Radio ServiceGMS Global Management System +Global Messaging Service [Novell]| TOP | UP to G | DN to I | BOTTOM |GMT Greenwich Mean Time.H Header (file name extension) [C]GND Ground (signal/system)HACMP High Availability Cluster Multi-GNN Global Network NavigatorProcessing [IBM]GNU Gnu's Not Unix (operating system) HAL Hard Array Logic + HardwareGNOME GNU Network Object Model Environment Abstraction Layer +GOAD GNOME Object Activation DirectoryHouse-Programmed Array LogicGOS Grade Of ServiceHAL * Heuristically Programmed AlgorithmicGOSIP Government Open Systems(computer)Interconnection Profile[from 1968 movie "2001: A Space.GOV Governmental (Domain Name) [Internet] Odyssey"]GP Gas Plasma + General PurposeHAP Host Access ProtocolGPF General Protection FaultHARP-MRI Harmonic Phase MRIGPI Graphics Programming Interface HASP Houston Automatic Spooling PriorityGPIB General Purpose Information/Interface (System)BusHBA Host Bus AdapterGPIO General Purpose Input/OutputHCL Hardware Compatibility ListGPL General Public LicenseHCSS High Capacity Storage SystemGPR General Purpose Register [IBM] HCT Hardware Compatibility TestGPRC Glass Passivated Rectifier Chip HCU Home Computer UserGPRS General Packet Radio ServiceHD Hard Disk + High DensityGPS Global Positioning Satellite/System + HDA Head Disk AssemblyGlobal Product SpecificationHDC High Dependability ComputingGPSS * General Purpose Systems Simulator [Carnegie Mellon](language)HDCD High Definition Compatible DigitalGPU Graphics Processing UnitHDCP High-Bandwidth Digital Content

Protection +HPGL Hewlett-Packard Graphics LanguageHigh Definition Copy Protection HPIB Hewlett-Packard Interface BusHDD Hard Disk DriveHPLJ Hewlett-Packard Laser JetHDF Hierarchical Data Format [NCSA] HPNA Home Phoneline Networking AllianceHDI Head to Disk InterferenceHPOM Home Page Objects Model [Microsoft]HDL Hardware Description LanguageHPPA Hewlett-Packard PrecisionHDLC High-Level Data Link ControlArchitectureHDM Hardware Device ModuleHPPI High Performance Parallel InterfaceHDMI High-Definition Multimedia Interface HPR High Performance Routing [IBM]HDML Handheld Device Markup Language HPSB High Performance Serial BusHDR Header + High Data Rate +HPTL High Performance Technical ComputingHigh Dynamic Range (photography) HPUX Hewlett-Packard Unix.HDR Header Data (file name extension) HPW High Performance Workstation [Sun]HDSC High Density Signal Carrier [DEC] .HQX BinHex (file name extension)HDSL (See DSL)[Macintosh]HDSS Holographic Data Storage System HRIS Human Resource Information SystemHDT Host Digital TerminalHRG High Resolution GraphicsHDTV High Definition TelevisionHRMS Human Resource Management SystemHDVD High Definition Volumetric Display HRTF Head Related Transfer FunctionHDW HardwareHS High SpeedHDX Half DuplexHSB Hue, Saturation, Brightness (colorHEOS High Earth Orbiting Satellitemodel)HERC HerculesHSC Hierarchical Storage Controller +HEX HexadecimalHigh Speed ChannelHFC Hybrid Fiber-CoaxialHSDPA High Speed Download Packet AccessHFS Hierarchical File System [Macintosh] HSI Hue, Saturation, IntensityHFT High Function Terminal [IBM]HSM Hierarchical Storage ManagementHGA Hercules Graphics AdapterHSP High Speed Printer/ProcessorHGCP Hercules Graphics Card PlusHSSI High Speed Serial InterfaceHGP Human Genome ProjectHST High Speed Technology [U.S. Robotics]HH Hour.HST History + Host (file name extensions)HID Human Interface DeviceHSV Hue Saturation ValueHIDS Host-Based Intrusion Detection System HTL Human In The LoopHIF Hyper-G Interchange FormatHTML HyperText Markup LanguageHIFD High-Density Floppy DiskHTTP HyperText Transfer ProtocolHIL Human Interface Link [HP]HTTP-NG HTTP Next GenerationHIMEM High MemoryHTTPS HyperText Transfer Protocol SecureHIPPI High Performance Parallel Interface HUD Heads Up DisplayHLA High Level ArchitectureHUT Hopkins Ultraviolet TelescopeHLCO High Low Close OpenH/V Horizontal/VerticalHLL High Level LanguageHVD Holographic Versatile DiscHLLAPI High Level Language Application HVP Horizontal & Vertical PositionProgramming InterfaceH/W Hardware.HLP Help (file name extension)HWCP Hardware Code PageHLQ High Level QualifierHWD Height-Width-DepthHLS Hue, Luminance, Saturation (color HWDM Hyperfine Wave Division Multiplexingmodel).HYP Hyphenation (file name extension)HLT HaltHYTELNET Hypertext-browser for TelnetHMA High Memory Area [Microsoft] + Accessible SitesHub Management ArchitectureHz HertzHMD Head Mounted DisplayHMI Human-Machine InterfaceHMM Hidden Markov ModelHMMP Hyper-Media Management ProtocolHMOS High Density Metal OxideI...Semiconductor +High Speed Metal Oxide SemiconductorHMP Host Monitoring Protocol| TOP | UP to H | DN to J | BOTTOM |HOL High Order LogicIA Intel Architecture [Intel]HOLAP Hybrid OLAPIAB Internet Architecture BoardHOTT Hot Off The Tree (electronicIAC Inter-Application Communicationnewsletter)[Macintosh]HOV High Occupancy VehicleIAD Integrated Access DeviceHP Hewlett-Packard (Company)IAEC International Address Element CodeHPC Handheld Personal ComputerIAFIS Integrated Automatic FingerprintHPCC High Performance Computing andIdentification SystemCommunicationsIAG Instruction Address GenerationHPDJ Hewlett-Packard Desk JetIAK Internet Access Kit [IBM]HPFS High-Performance File SystemIAL * International Algorithmic LanguageHPG Hewlett-Packard Graphics(ALGOL was first called IAL)

IANA Internet Assigned Numbers AuthorityInternet Database ConnectorIAP Internet Access Provider[Microsoft] +IAS Internet Access ServerInternet Data CenterIAT Import Address TableIDDE Integrated Development & DebuggingIAUP Internet User Account Provider Environment [Symantec]IBC Instrument Bus ComputerIDE Imbedded Drive Electronics +IBCS Intel Binary CompatibilityIntegrated Development EnvironmentSpecification[Borland] +IBIP Information Based Indicia ProgramIntegrated Device/Drive Electronics +[U.S. Postal Service]Intelligent Drive Electronics +IBL Inbound Links [Google]Interactive Design and Engineering +IBM International Business MachinesInterface Design Enhancement(Corporation)IDEA International Data EncryptionIBM-GL IBM Graphics LanguageAlgorithmIC Input Circuit + Integrated Circuit + IDEN Integrated Data Enhanced NetworkInterrupt ControllerIDF Intermediate Distribution FrameICA Intelligent Console Architecture + IDI Initial Domain IdentifierIntra-application Communications Area IDIV Integer DivideICANN International Corporation forIDL Interactive Data Language +Assigned Names and NumbersInterface Definition LanguageICAP Internet Calendar Access Protocol IDM Integrated Document Management[Lotus]IDMS Integrated Data Base ManagementICAS Intel Communicating Applications SystemSpecificationsIDNX Integrated Digital Network ExchangeICB Internet Citizen's Band[IBM]ICCP Institute for the Certification of IDP Integrated Data ProcessingComputing ProfessionalsIDR Intelligent Document RecognitionICD International Code DesignatorIDS Image Display System + IntrusionICE In-Circuit Emulator [Intel] +Detection SystemIntegrated Computing Environment IDSL (See DSL)[Langley Research] +IDT Interface Design Tool + InterruptInternal Compiler ErrorDescriptor TableICES Interference-Causing Equipment .IDX Index (file name extension)StandardIE Internet Explorer [Microsoft]ICF Internet Connection FirewallIEC International Electrotechnical[Microsoft]CommissionICI Image Component Information + Inter- IEEE Institute of Electrical andCPU InterruptsElectronics EngineersICL Interface ClearIEF Information Engineering FacilityICLID Incoming-Call Line Identification IEMSI Interactive Electronic Mail StandardICM Image Color Matching [Kodak] +IdentificationIncoming MessageIEN Internet Engineering Notes.ICM Image Color Management (file name IETF Internet Engineering Task Forceextension)IESG Internet Engineering Steering GroupICMP Internet Control Message Protocol I/F Interface[Novell]IFC Internet Foundation Classes.ICO Icon (file name extension)IFD Image File DirectoryICOMP (iCOMP)Intel ComparativeIFF Interchangeable File Format [Amiga]MicroprocessorIFG Incoming Fax GatewayPerformance [Intel]IFP Instruction Fetch PipelineICP Image Coprocessor + Integrated IFS Installable/Integated File SystemChannel ProcessorIFSM Information Systems ManagementICQ I Seek You (messaging program0 IGA Integrated Graphics ArrayICR Intelligent Character Recognition IGC Integrated Graphics ControllerICS Internet Connection SharingIGES Initial Graphics Exchange Standard[Microsoft] +IGFET Insulated-Gate Field EffectIntuitive Command StructureTransistorICSAPI Internet Connection Services API IGMP Internet Group Management/MulticastICU Instruction-Cache Unit +Intel Configuration UtilityProtocolIGP Interior Gateway Protocol[Microsoft] +IGRP Interior Gateway Routing ProtocolISA Configuration Utility[Cisco]ID Identification + IdentifierIGS Internet Go ServerIDA Integrated Digital Access +IHD Integrated Help Desk [IBM]Intelligent Disk Array +IHV Independent Hardware VendorIntelligent Drive ArrayIIF Immediate InterfaceIDAPI Integrated Database Application III Interstate Identification IndexProgramming Interface[NCIC]IDC Integrated Database/Desktop Connector IIOP Internet Inter-ORB Protocol+IIR Immediate Impulse Response

IIS Internet Information Server/Services IOC Inter-Office Channel[Microsoft]IOCC Input/Output Channel Converter +IITF Information Infrastructure Task ForceInput/Output Controller ChipIKE Internet Key ExchangeIOCS Input/Output Control SystemIKMP Internet Key Management Protocol IOCTL Input/Output ControlIKP Internet Keyed Payments [IBM]IODE Integrated Development and DebuggingILA Image Light AmplifierEnvironment [Symantec]ILE Integrated Language Environment [IBM] IOF Infrared Optical FilmILEC Incumbent Local Exchange Carrier IOP Input/Output ProcessorILM Information Life-Cycle Management IOPL Input/Output Privilege LevelILP Instruction-Level ParallelismIOR Interoperable Object ReferenceILS International Language Support IOS Internet Operating SystemIM Instant MessengerIOSGA Input/Output Support Gate ArrayIMAC Internet Macintosh [Apple]IP Instruction Pointer + IntellectualIMACS Image Management and Communication Property +SystemInternet ProtocolIMAP Interactive Mail Access Protocol + IPBF Installed Peripheral Base FlexibilityInternet Message Access Protocol IPC Instructions Per Clock + InterprocessIMAX Maximum ImageCommunicationIMDB In-Memory DatabaseIPCMOS Interlocked Pipeline CMOS [IBM]IMDS Image Data Stream (format) [IBM] IPCP Internet Protocol Control ProtocolIME Input Method Editor/EngineIPCS Integrated PC ServerIMEI International Mobile Equipment IPDC Internet Protocol Device ControlIdentifierIPDS IBM Personal Dictation System [IBM] +IMG ImageIntelligent Printer Data Stream [IBM].IMG Image Data (file name extension) IPF Invalid Page FormatIML Initial Microcode Load [IBM]IPFC Information Presentation FacilityIMP Information/Interface MessageCompiler [IBM]Processor +IPI Intelligent Peripheral InterfaceInternet/Intranet Input MethodProtocolIPL Initial Program Load/Loader +Ion Projection LithographyIMPA Intelligent Multi-Port Adapter [DCA] IPL * Information Programming LanguageIMPI Interoperable Message PassingIPM Images Per Minute + InterpersonalInterfaceIMPP Internet Messaging and PresenceMessageIPMI Intelligent Platform ManagementProtocolIMR Internet Monthly ReportInterfaceIPNG Internet Protocol, next generationIMS Information Management System + IPP Integrated Performance PrimitivesIntermediate Maintenance Standards [Intel] +IMSI International Mobile SubscriberInternet Printing ProtocolIdentifierIPR Intellectual Property RightsIMSP Internet Message Support Protocol IPSE Integrated Project SupportIMTC International MultimediaEnvironmentTeleconferencing ConsortiumIPSEC Internet Protocol SecurityIMTV Interactive Multimedia Television IPTC International PressIMUL Integer MultiplyTelecommunications CouncilIMUX Inverse MultiplexerIPTV Internet Protocol TelevisionIN InputIPX Internetwork Packet Exchange [Novell]INC IncrementIQL Interactive Query Language.IND Index (file name extension)IR Infrared.INF Information (file name extension) IRC Internet Relay Chat.INFO Information Services (Domain Name) IRD Integrated Receiver/Descrambler[Internet]IRDA (IrDA)Infrared Data AssociationINFS Internet Network File SystemIRDS Information Resource Dictionary.INI Initialize (file name extension) SystemINIT Initialization + InitializeIRET Interrupt ReturnINM Integrated Network ManagementIRF Intermediate Routing Function +INND Internet News DaemonInheritance Rights Filter [Novell]INS Input String + Integrated Network IRL Interactive Reader Language + Inter-ServerRepeater LinkINT Integer + Internal + Interrupt + IRLAP Infrared Link Access Protocol.INT International Organization (Domain IRLED Infrared Light Emitting Diodename) [Internet]IRM Information Resource Management +INTA Interrupt AcknowledgeInherent Rights MaskINTEL Integrated Electronics (company) IRP I/O Request PacketINTERNIC (InterNIC)Internet NetworkIRQ Interrupt RequestInformation CenterIRQL Interrupt Request LevelINTO Interrupt if Overflow occursIRTF Internet Research Task ForceI2O Intelligent Input/OutputIRX Information Retrieval ExperimentI/O Input/OutputIS Information System + Interrupt Status

ISA Industry Standard Architecture (bus) ITX Intermediate Text Block[IBM] +IU Integer UnitInstruction-Set ArchitectureIUAP Internet User Account ProviderISAKMP Internet Security Association and Key IUS/ITB Interchange UnitManagement ProtocolSeparator/Intermediate TransmissionISAM Indexed Sequential-AccessBlockManagement/MethodIVDS Integrated Voice and Data SystemsISAPI Internet Server API [Microsoft] IVIS Interactive Video Information SystemISAPS Intelligent Scene Analysis based on IVL Independent Vendor League + IntelPhotographic Space [Canon]Verification LabISBN International Standard Book Number IVR Interactive VoiceISC Instruction Set Computer + Inter- Recognition/ResponseSystemsIVS Interactive Videodisk SystemCommunication [IBM]IVT Interrupt Vector TableISCSI (iSCSI) Internet SCSIIV&V Independent Verification & ValidationISD Image Section Descriptor +I-WAY Information HighwayInstructional Systems DesignIXC Interexchange CarrierISDN Integrated Services Digital NetworkISH Information Super HighwayISI Internally Specified IndexISIS Integrated Systems and InformationServicesJ...ISKM Internet Starter Kit for theMacintoshISL Interactive System Language +| TOP | UP to I | DN to K | BOTTOM |Inter Switch Link [Cisco]JA Jump Address + Jump if AboveISM Integrated Services Model [IETF] + JAD Joint Application Design/DevelopmentInternet Service Manager [Microsoft] JADE Java Addition to the Default SystemISMF Interactive Storage Management JAE Jump if Above or EqualFacilityJANET Joint Academic NetworkISOC Internet SocietyJAR Java Archive (file format)ISO International Organization for JAVAME Java Platform Micro EditionStandardizationJAXM Java API for XML MessagingISP Internet Service Provider + Interrupt JBE Jump if Below or EqualStack Pointer +JC Jump if Carry setInterrupt Status PortJCA Java Cryptography ArchitectureISPF Interactive System Programming JCE Java Cryptography ExtensionFacilityJCL Job Control LanguageISR Information Storage and Retrieval + JDBC Java Database ConnectivityInterrupt Service Routine +JDF Job Description formatInterrupt Status RegisterJDK Java Development KitISRC International Standard Recording Code JDSL Java Data Structures LibraryISS Internet Sharing SoftwareJE Jump if EqualISSN International Standard Serial Number JEDEC Joint Electronic Devices EngineeringISV Independent Software VendorCouncilIT Information TechnologyJEIDA Japanese Electronics IndustryITB Information Technology Branch + Development AssociationIntermediate Text BlockJEPI Joint Electronic Payment InitiativeITC International Typeface Corporation JES Job Entry SystemITE Information Technology Equipment JFC Java Foundation ClassesITF Interactive Test FacilityJFET Junction Field Effect TransistorITIL Information Technology Infrastructure JFIF JPEG File Interchange FormatLibraryJFS Journaled File System [IBM]ITN Identification Tasking and Networking JG Jump if GreaterITP Internet Transaction Processing JGE Jump if Greater or EqualITR Information Technology Research [NSF] JHUAPL Johns Hopkins University+Applied Physics LaboratoryInput Transaction Record + Internet JIPS JANET Internet Protocol ServiceTalk RadioJIT Just-In-Time (compiler)ITSM Information Technology Service JL Jump if LessManagementJLE Jump if Less than or Equal toITU International Telecommunications JLIP Joint Level Interface ProtocolUnionJMAPI Java Management Application ProgramITUG International Telecommunications User InterfaceGroupJ2ME Java 2 Platform Micro EditionITU-TIES ITU-Telecom Information Exchange JMF Java Media Framework [Sun]ServicesJMI Java Metadata InterfaceITU-TSS ITU-Telecommunication Standards JMP JumpSectionJMS Java Message ServiceITV Interactive TelevisionJMX Java Management Extensions

JNA Jump if Not AboveJNAE Jump if Not Above or EqualJNB Jump if Not BelowJNBE Jump if Not Below or EqualJNG Jump if Not GreaterJNGE Jump if Not Greater or EqualJNI Java Native Interface.JNK Junk (file name extension)JNLE Jump if Not Less or EqualJNO Jump if No OverflowJNP Jump if No ParityJNS Jump if No SignJOE Java Objects EverywhereJOHNNIAC* John Neumann Integrator andAutomatic Computer [Rand Corp.]JOSS * Johnniac Open Shop System [RandCorp.]JOVIAL Jules' Own Version of theInternationalAlgorithmic LanguageJPE Jump if Parity EvenJPEG Joint Photographic Experts GroupJPL Jet Propulsion LaboratoryJPNF Join-Projection Normal FormJPO Jump if Parity OddJRE Java Runtime EnvironmentJS Jump if SignJSP Java Server PageJSR Java Specification RequestJSSE Java Secure Socket ExtensionJTAG Joint Test Action Group [IEEE]JTAPI Java Telephony ApplicationProgramming InterfaceJZ Jump if ZeroJNZ Jump if Not ZeroJSS Java-Script Style SheetJUGHEAD Jonzy's Universal Gopher HierarchyExcavation and Display [Internet]JVM Java Virtual MachineK...| TOP | UP to J | DN to L | BOTTOM |K-12 Kindergarten through 12th Grade [USEducation System]KAM Keep Alive MemoryKb KilobitKB Keyboard + Kilobyte (1,024 bytes)KBD Keyboard (also KEYB)KBD$ Keyboard [OS/2]KBE Knowledge Based EngineeringKbps Kilobits Per SecondKBps Kilobytes Per SecondKDE K Desktop EnvironmentKDT Key Definition TableKEFIR Key Findings Reporter [GTE]KEYBBE Foreign language KEYBoard program -BelgiumKEYBBR Foreign language KEYBoard program -BrazilKEYBCF Foreign language KEYBoard program -Canadian-FrenchKEYBCZ Foreign language KEYBoard program -Czechoslovakia(Czech)KEYBDK Foreign language KEYBoard program -DenmarkKEYBFR Foreign language KEYBoard program -FranceKEYBGR Foreign language KEYBoard program -GermanyKEYBHU Foreign language KEYBoard program -HungaryKEYBIT Foreign language KEYBoard program -ItalyKEYBLA Foreign language KEYBoard program -Latin AmericaKEYBNL Foreign language KEYBoard program -NetherlandsKEYBNO Foreign language KEYBoard program -NorwayKEYBPL Foreign language KEYBoard program -PolandKEYBPO Foreign language KEYBoard program -PortugalKEYBSF Foreign language KEYBoard program -Swiss-FrenchKEYBSG Foreign language KEYBoard program -Swiss-GermanKEYBSL Foreign language KEYBoard program -Czechoslovakia(Slovak)KEYBSP Foreign language KEYBoard program -SpainKEYBSU Foreign language KEYBoard program -FinlandKEYBSV Foreign language KEYBoard program -SwedenKEYBUK Foreign language KEYBoard program -United KingdomKEYBUS Foreign language KEYBoard program -United StatesKEYBYU Foreign language KEYBoard program -YugoslaviaKHz KilohertzKIF Knowledge Interchange FormatKIPS Kodak Internet Print Service [Kodak]KIS Knowbot Information Service[Internet]KMZ Keyhole Markup LanguageKPI Kernel Programming InterfaceKQML Knowledge Query and ManipulationLanguageKRS Knowledge Retrieval SystemKSDS Keyed Sequential Data SetKSH Korn Shell (program) [Unix]KSPH Keystrokes Per HourKSR Keyboard Send ReceiveKVM Keyboard, Video, Mouse (switch) +Kilobyte Virtual MachineL...| TOP | UP to K | DN to M | BOTTOM |L2F Layer Two Forwarding [Cisco]L2TP Layer Two Tunneling ProtocolLADDR Layered Device Driver Architecture[Microsoft]LALL Longest Allowed Lobe LengthLAN Local Area NetworkLANACS Local Area Network AsynchronousConnection Server

LANDP LAN Distributed PlatformL2F Layer 2 Forwarding (protocol) [Cisco]LANE Local Area Network EmulationLFAP Lightweight Flow Admission ProtocolLANG LanguageLFE Low Frequency EffectsLAP Linux Application PlatformLFI Last File IndicatorLAPB Link Access Procedure Balanced LFM Log File Monitor(protocol)LFN Long File NameLAPD Link Access Procedure on the D- LFT Low Function Terminal [IBM]Channel (protocol)LFU Least Frequently UsedLAPM Link Access Procedure for Modems LGA Leadless Grid ArrayLAR Load Access RightsLGDT Load Global Descriptor TableLASER Light Amplification by Stimulated LGPL Lesser General Public License [GNU]Emission of RadiationLIAS Library Information Access SystemLASTport Local Area Storage Transport.LIB Library (file name extension)(protocol) [DEC]LIC Line Interface Coupler [IBM]LAT Local Access Terminal +LICS Lotus International Character SetLocal Area Transport [DEC][LDC]LATA Local Access and Transport Area LIDT Load Interrupt Descriptor TableLAVC Local Area VAX ClusterLIEP Large Internet Exchange PacketLAWN Local Area Wireless Network[Novell]LB Left Button (of 2 or 3 button Mouse) LIF Low Insertion ForceLBA Logical Block AddressingLIFO Last In, First OutLBL LabelLILO Last In, Last OutLBR LibrarianLIM Lotus/Intel/Microsoft.LBR Library (file name extension)LIMA Lotus/Intel/Microsoft/ASTLBT Listen Before TalkLIMDO Light Intensity Modulation DirectLBX Local Bus AcceleratorOverwriteLCA Lotus Communications Architecture LIMM Light Intensity Modulation Method[Lotus]LIMS Library Information Management SystemLCC Leadless Chip CarrierLINQ Language Integrated QueryLCCM LAN Client Control Manager [IBM] LINUX (Operating system named after LinusLCD Liquid Crystal Display + Lowest Torvalds)Common DenominatorLIP Large Internet PacketLCF Low Cost FiberLIPO (LiPo) Lithium Polymer (battery)LCK Library Construction Kit [Microsoft LIPS Lightweight Internet Person Schema +FoxPro]Logical Inferences Per SecondLCOS (LCoS) Liquid Crystal on Silicon LISP List Processing (Language)(See HLL)LCP Link Control ProtocolLISTSERV List Server [Internet]LCR Least Cost Routing + Line Control LIU LAN Interface UnitRegisterLIW Long Instruction WordLCS Link Connection SubsystemLLC Logical Link ControlLCSD Laminate Chip Signal DiodeLLDT Load Local Descriptor TableLCU Last Cluster UsedLLF Low Level FormatLDA Logical Device AddressLLTD Link Layer Topology DiscoveryLDAP Lightweight Directory Access Protocol (protocol)[IBM]LMB Left Mouse ButtonLDC Lotus Development CorporationLMBCS Lotus Multi-Byte Character SetLDDS Long Distance Discount Services [Lotus](company)LMD Last Modification DateLDM Logical Disk Manager + Long Distance LMDS Local Multipoint Distribution ServiceModemLMI Link/Local Management InterfaceLDP Label Distribution ProtocolLMOS Leave Mail On ServerLDT Local Descriptor TableLMR Land Mobile RadioLE Less or EqualLMS Lotus Messaging Switch [Lotus]LEA Load Effective AddressLMSW Load Machine Status WordLEAD Live Early Adoption and Demonstration LMU LAN Management Utilities [IBM] +[W3C]LAN Manager for UnixLEAF Law Enforcement Access FieldLN Load Number + Logarithm (Natural)LEC Local Area Network Emulation Client + LNA Local Network AdministratorLocal Exchange CarrierLN:DI Lotus Notes:Document ImagingLED Light Emitting DiodeLNK LinkLEL Link, Embed and Launch-to-edit LOB Line of Business[Lotus]LOC Lines Of Code + Loop On-Line ControlLEM Language Extension ModuleLOCIS Library of Congress InformationLEN Low Entry NetworkingSystemLEO Low Earth OrbitLOD Letter Of Destruction + Level OfLEP Light-Emitting PolymersDetailLES Local Area Network Emulation Server LODSB Load String Byte.LET Letter (file name extension)LOG Logarithm (Base 10)LEX LexiconLOGO (Programming Language)(See HLL)LF Line FeedLON Local Operating Network

LOOPE Loop while EqualLOOPNE Loop while Not EqualLOOPNZ Loop while Not ZeroLOOPZ Loop while ZeroLORE Line Oriented EditorLPAR Logic Programming and AutomatedReasoningLPC Local Procedure CallLPD Line Printer Daemon (protocol)[Berkley]LPDU Logical Protocol Data UnitLPI Lines Per InchLPL Lotus Programming Language [Lotus 1-2-3] [LDC]LPM Lines Per MinuteLPN Logical Page NumberLPR Line Printer + Line Printer RemoteLPS Low-Power SchottkyLPT Line Printer TerminalLPT1 First Parallel Printer PortLPT2 Second Parallel Printer PortLPT3 Third Parallel Printer PortLQ Letter QualityLQM Link Quality Monitoring (protocol)LR Link RegisterLRC Local Register Cache +Longitudinal Redundancy CheckLRL Least Recently LoadedLRM Language Reference Manual + LeastRecently-Used Master.LRS Language Resource (file nameextension) [WordPerfect]LRU Least Recently UsedLSA LAN and SCSI Adapter [IBM] + LineSharing Adapter +Local Security Authority [Microsoft]LSAPI License Services Application ProgramInterfaceLSASS Local Security Authority SubsystemService [Microsoft]LSB Least Significant BitLSC Least Significant CharacterLSD Least Significant DigitLSI Large Scale IntegrationLSL Link Support Layer + Load SegmentLimitLSP Layered Service Provider [Spybot]LSPR Logistics System Program ReviewLST List.LST List (file name extension)LTO Linear Tape OpenL2TP Layer 2 Transport/Tunneling ProtocolLTPS Low-Temperature PolysiliconLTR Left-To-Right + Letter + Load TaskRegisterLU Logical Unit (Also LUN)LUA Logical Unit Application (interface)LUI Local User InputLUIS Library User Information ServiceLUN Logical Unit NumberLUT Lookup TableLV Logical Volume [IBM]LVDS Low-Voltage Differential SignalingLVM Logical Volume Management [IBM]LW Lazy Write.LYR Lyrics (music file name extension)LZW Lempel-Ziv-Welch (algorithm)M...| TOP | UP to L | DN to N | BOTTOM |mA MilliampereMAC Macintosh (Apple Macintosh Computer)+Mandatory/Media/Medium Access Control+Message Authentication CodeMAC * Multiple Access Computers.MAC MacPaint (file name extension) +Macro (file name extension)MACH Multilayer Actuator Head [Epson]MADE Manufacturing and Automated DesignEngineeringMADYMO Mathematical Dynamic Modeling [TNO]MAE Merit Access Exchange + MetropolitanArea EthernetMAGMA Minimal Architecture for GeneralizedMarkup ApplicationsMAH (mAh)Milliampere-HourMAI Multiple Applications Interface.MAI Mail (file name extension)MAJC Microprocessor Architecture for JavaComputing [Sun]MALWARE Malicious SoftwareMAN Manual [Unix] + Metropolitan AreaNetworkMANIAC * Mathematical Analyzer NumericalIntegrator and ComputerMANPAGE Manual Page [Unix]MAP Maintenance Analysis Procedures +Manufacturing Automation Protocol +Memory Allocation Map.MAP Linker Map (file name extension)MAPI Mail/Messaging ApplicationsProgrammingInterface [Microsoft]MAPICS Manufacturing, Accounting andProductionInformation Control System [IBM]MARC Machine Readable Cataloging +Multi-Technology Automated ReaderCardMARVEL Machine-Assisted Realization of theVirtualElectronic Library [Library ofCongress]MASM Macro Assembler [Microsoft]MASS Maximum Availability and SupportSubsystem [Parallan]MAT Maintenance Access TerminalMAU Media Access/Adapter Unit +Multistation Access UnitMAVDM Multiple Application VDMMAX MaximumMB Megabyte (1,024 kilobytes) +Middle Button (of 3 button Mouse)MBASIC Microsoft BASIC [Microsoft]MBCS Multi-Byte Character Set [IBM]MBONE Multicast Backbone [Internet]MBps Megabytes Per SecondMbps Megabits Per SecondMBR Master Boot RecordMBX MailboxMCA Micro Channel Adapter/Architecture[IBM]MCAD Mechanical Computer Aided Design

MCB Memory Control Block[Microsoft]MCF Meta Content Framework +MFI Multifunction InterpreterMicrosoft Connector FrameworkMFIOP Multifunction I/O Processor[Microsoft]MFLOPS Million Floating Point Operations PerMCGA Multicolor Graphics ArraySecondMCH Memory Controller Hub [Intel]MFM Modified Frequency ModulationMCI MCI Communications Corp. (name from MFP Multi-Functioninitials ofPeripheral/Printer/Productoriginal company - MicrowaveMFPI Multifunction Peripheral InterfaceCommunications, Inc.) +Media Control Interface [Microsoft]MFS Macintosh File System [Macintosh] +Magnetic Tape Field Search + MemoryMCL Microsoft Compatibility LabsFile System[Microsoft]Modified Filing System [RevelationMCM Multi-Chip ModuleTechnologies]MCNE Master Certified Novell Engineer MFT Master File Table +[Novell]Multiprogramming with a Fixed numberMC-PGA Metallized Ceramic - Pin Grid Array of TasksMCPS Microsoft Certified ProductMGA Monochrome Graphics AdapterSpecialist [Microsoft]MGCP Media Gateway Control ProtocolMC-QFP Metallized Ceramic - Quad Flat Pack MGE Modular GIS EnvironmentMCR Modem Control RegisterMGET Multiple Get [Unix]MCSD Microsoft Certified Systems Developer MGML Minimal Generalized Markup Language[Microsoft]MGR ManagerMCSE Microsoft Certified Systems Engineer MHS Message Handling Service + Message[Microsoft]Handling SystemMCU Microcontroller Unit + Multi-Chip MHz MegahertzUnit [DEC] +MI Management InterfaceMultipoint Control UnitMIB Management Information BaseMD Make Directory + Mini Disk [Sony] + MIC Message Integrity Check + MicrophoneMonochrome DisplayMICR Magnetic Ink Character RecognitionMDA Mail Delivery Agent + Model Drive MICRO One-millionthArchitecture +MICS Macro Interpretive CommandsMonochrome Display Adapter +MID Mobile Information DeviceMultidimensional AnalysisMIDI Musical Instrument Digital InterfaceMDDBMS Multidimensional Data Base Management MIDP Mobile Information Device ProfileSystemMIF Management Information Format.MDF Menu Definition File (file name .MIF Management Information Files (fileextension)name extension)MDI Memory Display Interface +MIG Metal In GapMultiple Document InterfaceMII Microsoft/IBM/IntelMDIC Manchester Decoder and Interface Chip MIL Machine Interface Layer [Go[AT&T]Corporation] +MDK Multimedia Developers Kit [Microsoft] .MIL Military (Domain name) [Internet]MDLP Mobile Data Link ProtocolMIM Map Image Metafile + Metal-Insulator-MDR Metadata Repository + Minimum Design Metal (screen)RequirementMIMD Multiple Instruction Multiple DataMDX Multi-Dimensional ExpressionsStream (processor)MDY Month Day YearMIME Multimedia Internet Message.ME Opening Information (file name Extensions +extension) (As in READ.ME)Multipurpose Internet Mail ExtensionsMEB Memory Expansion BoardMI/MIC Mode Indicate/Mode Indicate CommonMED Minimum Expected DelayMIMO Multiple Input, Multiple OutputMEG MegabyteMIN Minimum + Mobile IdentificationMEM MemoryNumberMEMS Micro-Electro-Mechanical System MIND Microsoft Internet Developer.MEN Menu (file name extension)[Microsoft]MERCI Multimedia European ResearchMINUET Minnesota Internet Users EssentialConferencing IntegrationTools [Internet]MES Manufacturing Execution System MIPS Million Instructions Per SecondMESI Modified, Exclusive, Shared and MIR Music Information RetrievalInvalid (protocol)MIRAM Magnetoresistive Random Access MemoryMESSENGER Mercury Surface, Space Environment,GeochemistryMIS Management Information System +Multimedia Information Sourcesand Ranging [JHUAPL][Internet]MET Memory Enhancement TechnologyMISC Miscellaneous[Hewlett-Packard]MIX Member Information Exchange.MET Metafile (file name extension) .MIX Microsoft Picture It! (format)MFC Microsoft Foundation ClassMKDIR Make Directory[Microsoft]MKL Math Kernal Library [Intel]MFFS Microsoft Flash File SystemML Machine Language + Meta Language

NPL Nonprocedural LanguageNVT Network Virtual Terminal +NPN Negative Positive Negative (bipolarNovell Virtual Terminal [Novell]transistor)NWS NetWare Web Server [Netware]NPS Novell Productivity Specialist NYM Anonymous[Novell]NPT Non-Programmable TerminalNPTN National Public Telecomputing NetworkNPU Natural Processing Unit O...NPX Numeric Processor ExtensionNQS Network Queuing System [Cray]N(r) Number ReturnedNRC National Research Council (Canada)| TOP | UP to N | DN to P | BOTTOM |NREN National Research and Education OAB One-to-All BroadcastNetworkOAD Open Architecture Driver [Bernoulli]NRM Network Resource Manager + Normal OAG Official Airline Guide + Online AirResponse ModeGuideNRZ Not Return to ZeroOAI Open Applications InterfaceNRZI Non Return to Zero InvertedOAS One-to-All ScatterNS Nanosecond (one-billionth of a OASIS Organization for the Advancement ofsecond) +Structured Information StandardsNational Semiconductor (as in Ns16550 OBD On Board DiagnosticsUART) +OBEX Object Exchange [Borland]Network Supervisor + Non StopOBJ ObjectNSAP Network Service Access PointOC Optical CarrierNSAPI Netscape Server API [Netscape] OCE Open Collaborative EnvironmentNSA POLY National Security Agency Polygraph [Apple]NSERC National Sciences and Engineering OCF Objects Components FrameworkResearch Council(Canada)[Borland]OCL Object Constaint Language + OperationNSF National Science FoundationControl Language +NSFNET National Science Foundation NetworkOperator Control LanguageNSI NASA Science InternetOCR Optical Character RecognitionNSLOOKUP Name Server Lookup [Unix]OCS On-Card SequencerNSM Netscape Server Manager [Netscape] OCSP Online Certificate Status ProtocolNSP Native Signal Processing [Intel] + OCX OLE Custom ControlNetwork ServiceODA Open Document ArchitectureProviderODAPI Open Database Application ProgrammingNSSC NASA Standard Spacecraft ComputerInterface [Borland]NSTC National Science and Technology ODBC Object-Oriented Database ConnectivityCouncilNSTL National Software Testing Labs+Open Database Computing +NT New Technology [Microsoft]Open Data Base ConnectivityNT-1 Network Terminator Type 1[Microsoft]NTAS NT Advanced Server [Microsoft] ODBMS Object-Oriented Database ManagementNTF No Trouble FoundSystem (alsoNTFS New Technology File Systemsee OODMS)[Microsoft]ODI Open Datalink Interface [Novell] +NTIA National Telecommunications andOpen Device Interconnect [NetWare]Information AdministrationODIF Open Document Interchange FormatNTIS National Technical Information ODL Object Definition LanguageServiceNTLDR New Technology Loaders [Microsoft]ODM Object Data Manager [IBM] +Optimized Distribution Model [Compaq]NTP Network Time ProtocolODMA Open Document Management APINTRAS NT Remote Access Services [Microsoft] ODP Open Distributed ProcessingNTSA NetWare Telephony ServicesODS Open Data Services [Microsoft] +Architecture [Novell]Operational Data StoreNTSC National Television StandardsODSI Open Directory Service InterfaceCommittee[Microsoft]NTU Network Termination UnitODT Open DesktopNUI Network User Identification +OEL Organic Electroluminescent (display)Network User Interface +OEM Original Equipment ManufacturerNotebook User Interface [GoOEP Operand Execution PipelineCorporation]OF Overflow FlagNUL Null + (dummy device) + (no device) OFB Output Feedback (mode)NUMA Non-Uniform Memory AccessOFDM Orthogonal Frequency DivisionNV No OverflowMultiplexingNVM Non-Volatile MemoryOFMT Output Format for NumbersNVOD Near-Video On DemandOFS Object File System [Microsoft] +NVP Nominal Velocity of Propagation Output Field SeparatorNVRAM Non-Volatile Random Access Memory OFX Open Financial Exchange

OGSA Open Grid Services Architecture .ORG Non-Profit Organizations (DomainOGSI Open Grid Services Infrastructure name) [Internet]OH Off HookORI Online Retrieval InterfaceOHCI Open Host Controller Interface .ORI Original (file name extension)OID Object IdentifierORL Optical Return LossOIDL Object Interface Definition Language OROM Optical Read-Only MemoryOIS Office Information System +ORS Output Record SeparatorOptical Image StabilizerOS Operating SystemOLAP Online Analytical ProcessingOS/2 Operating System/2 [IBM]OLCP Online Complex ProcessingOSA Open Scripting/System Architecture.OLD Old version (file name extension) OSCAR Open Source Cluster ApplicationOLE Object Linking and EmbeddingResources[Microsoft]OSD On Screen Display +OLED Organic Light Emitting DiodeOpen SoftwareOLGA Online Guitar ArchiveDescription/DistributionOLI Optical Line Interface [AT&T]OSE Office Server Extensions [Microsoft]OLMC Output Logic MacrocellOS/E Operating System/EnvironmentOLSP Online Service ProviderOSF Open Software FoundationOLTP Online Transaction ProcessingOSGI (OSGi) Open Services GatewayOM Object ManagerInitiativeOMA Object Management Architecture OSI Open Systems Interconnection[Microsoft]OSINT Open Source IntelligenceOME Open Messaging Environment (protocol) OSM Off-Screen ModelOMF Object Module Format [Microsoft] + OSP On-Screen Programming + OpticalOpen Media Framework + Open Message Storage ProcessorFormatOSPF Open Shortest Path FirstOMG Object Management GroupOSQL Object Structured Query LanguageOMI Open Messaging Interface [Lotus] OSR2 OEM Service Release 2 [Microsoft]OML Object Manipulation LanguageOSS Open Source SoftwareOMR Optical Mark RecognitionOT Object TechnologyONC Open Network Computing [Sun]OTA Operation-Triggered Architecture +ONDS Open Network Distribution Services Over The Air[IBM]OTDR Optical Time Domain ReflectometerONE Open Network Environment [Netscape] OTF Open Token FoundationONMS Open Network Management System OTI Object Technology International [IBM]ONU Optical Network UnitOTP One-Time ProgrammableOOAD Object-Oriented Analysis and Design OUI Organizational Unique IdentifierOOB Out Of BandOURS Open Users Recommended SolutionsOODB Object-Oriented Database.OUT Outlines (file name extension)OODMS Object-Oriented Database Management OUTS Output StringSystem (alsoOV Overflowsee ODBMS)OVAL Object-Based Virtual ApplicationOOL Object-Oriented LanguageLanguage [Psion] +OOOS Object-Oriented Operating SystemOpen Vulnerability AssessmentOOPL Object-Oriented Programming Language Language [US-CERT]OOPS Object Oriented Programming and .OVL Program Overlay (file name extension)Systems.OVR Program Overlay (file name extension)OOS Object-Oriented Systems +OWA Outlook Web Access [Microsoft]Off-line Operating SimulatorOWL Object/Open Windows Library [Borland]OOT Object-Oriented TechnologyOOUI Object Oriented User InterfaceOP Operation + Optical + OutputOPAC Online Public Access Catalog[Internet]P...OPC Open Process Control +Organic/Optical PhotoconductorOPCODE Operational Code| TOP | UP to O | DN to Q | BOTTOM |OPD OperandP3P Platform for Privacy PreferencesOPI Open Prepress InterfaceProjectOPM Operations Per MinutePAB Personal Address BookOPS Open Profiling Standard + Oracle PABX Private Automatic Branch ExchangeParallel Server [Oracle]PACE Priority Access Control EnabledOPT Open Protocol Technology[3Com].OPT Options (file name extension)PACS Picture Archiving and CommunicationOPUS Octal Program Updating SystemSystemOQL Object Query LanguagePACS-L Public Access Computer Systems ListORACLE On-Line Inquiry and Report Generator [Internet](UNIX DB program)PAD Packet Assembler/Disassembler +ORB Object Request Broker [Microsoft]Portable Application DescriptionORDVAC * Ordnance Variable Automatic Computer PADS Pen Application Development System

[Slate Corporation]PAIH Public-Access Internet Host[Internet]PAIS Public-Access Internet Site[Internet].PAK Packed (compressed file nameextension) [NoGateConsulting]PAL Paradox Applications Language[Borland] +Phase Alternating Line + PortableAudio Laboratory +Programmed Array Logic + ProgrammingAssembly LanguageProgramming Assembly Language.PAL Palette (file name extension)PALC Plasma-Addressed Liquid Crystal(display)PALS Principles of the Alphabet LiteracySystemPAM Pluggable Authentication Module(library) +Pulse Amplitude ModulationPAN Personal Area Network [GTE]PAP Packet-level Procedure +Password Authentication Protocol +Picture And Picture +Push Access Protocol + Printer AccessProtocolPAR Personal Animation Recorder +ParallelPARA ParagraphPARC Palo Alto Research Center [XEROX]PA-RISC Precision Architecture-RISC [HP].PAS PASCAL source code (file nameextension)PASCAL (Programming Language named forBlaise Pascal)PAT Port Address Translation.PAT Patch + Pattern (file nameextensions)PATA Parallel Advanced TechnologyAttachmentPATN Promotional Port Access TelephoneNumberPAUSE Perl Automatic Upload ServerPAX Portable Archive Exchange [Unix]PB Petabyte (1,024 terabytes)(One Million Billion characters ofSystem [IBM]PCEB PCI to EISA Bridge [Intel]PCI Peripheral ComponentInterconnect/InterfacePCIC PC-Card Interrupt ControllerPCIE PCI Express (slot)PC-I/O Program Controlled I/OPCL Printer Command Language [HP] +Process Control LanguagePCM Personal Computer Manufacturer +Printer Cartridge Metric [HP] +Pulse Code ModulationPCMA Paired Carrier Multiple AccessPCMC PCI, Cache, Memory Controller [Intel]PCMCIA Personal Computer Memory CardInternational AssociationPCMIM Personal Computer Media InterfaceModulePCN Personal Computer NetworkPCNFS Personal Computer Network File SystemPCO Point of Control and ObservationPCS Patchable Control Store +Personal CommunicationServices/System +Personal Conferencing Specification +Planning Control Sheet + PrintContrast Signal +Process Control Systems + ProgramCounter Store +Project Control SystemPCT Private Communications Technology +Program Control Table.PCT Picture (file name extension).PCX PC Paintbrush/Picture Image (filename extensions)PD Phase-Change Dual + Public DomainPDA Personal Digital Assistant.PDB Palm Database (file name extension) +Program Database (file nameextension)PDC Primary Domain ControllerPDD Physical Device Driver + PortableDigital DocumentPDF Package Definition File + PortableDocument Format +Portable Document File + ProcessorDefined Function +Program Development Facility.PDF Printer Description (file nameinformation)extension)[Borland,Lotus]PBA Printed Board AssemblyPDH Plesiosynchronous Digital HierarchyPBC Plain-Text Block ChainingPDIAL Public Dialup Internet Access ListPBE Prompt By Example[Internet]PBGA Plastic Ball Grid ArrayPDL Page Description Language + ProgramPBP Picture-By-PictureDescription LanguagePBR Policy-Based Routing [Cisco]+ Program Design LanguagePBT Provider Backbone TransportPDM Product Data ManagementPBX Private Branch ExchangePDN Public Data NetworkPC Personal Computer + Printed Circuit + PDO Portable Distributed Objects [Next]Program CounterPDP Parallel Data Processing + PlasmaPCACIAS Personal Computer AutomatedDisplay Panel +Calibration IntervalAnalysis SystemProgrammable Data Processor +(DEC Computer System Designation,PCB Printed Circuit Board + Program i.e. PDP-8, PDP-11)Control BlockPDS Packet Driver Specification +PCBC Plain/Propagating Cipher Block Partitioned Data Set +ChainingPCC Proof Carrying CodePlanetary Data System + PortableDocument Software +PCD Photo Compact DiskProcessor Direct Slot [Macintosh]PC-DOS Personal Computer - Disk Operating PDSN Packet Data Serving Node

PDSS Post Development and Software Support Selection [W3C]PDT Performance Diagnostic Tool [IBM] +Programmable Drive TablePICTPIDPicturePacket Identifier + PhysicalPDU Plug Distribution Unit + Protocol Interface Device +Data Unit.PDX Paradox files (file name extension)Process Identification Number +Product ID +[Borland] +Printer Description Extension (file PIERProportional, Integral, DerivativeProcedures for Internet/Enterprisename extension)RenumberingPE Parity Even + Processing Element + PIF Picture Interchange Format File +Protect EnableProgram Information FilePEA Pocket Ethernet AdapterPII Program Integrated InformationPEB Personal Electronic BallotP4EE Pentium 4 Extreme Edition [Intel]PEL Picture Element [IBM]PEM Privacy-Enhanced Mail [Internet]PEN SDK Pen Computing Software DevelopmentKitPEP Packet Exchange Protocol +Packetized Ensemble Protocol[Telebit]PERC Power Edge RAID ControllerPERL Practical Extraction and Report (present usage)Language [Unix]PING Packet Internet GroperPERT Program Evaluation and ReviewPIO Parallel Input/Output + ProcessorTechniquePES Positioning Error Signal + ProcessorInput/Output +Programmed Input/OutputEnhancement SocketProcessor Upgrade SocketPIP Pattern and Information Processing +Personal Identity Provider +PET Print Enhancement Technology [Compaq]Personal Information Portal +.PFB Printer Font Binary (file namePicture-In-Picture +extension)Problem Isolation Procedure +PFE Programmer's File EditorProgrammable Interconnect Point.PFM Printer Font Metrics (file name PIPO Parallel In, Parallel Outextension) [Windows]PIR Protocol Independent RoutingPFN Page Frame NumberPIT Programmable Interval TimerPFR Portable Font Resource + Power-Fail PIXEL Picture ElementRestartPGA Pin Grid Array + ProfessionalPJPEGPKProgressive JPEGPack + Primary KeyGraphics Adapter [IBM]PKC Public Key CryptographyPGC Program Group Control [Microsoft] PKE Public Key EnabledPGDN Page DownPKI Public Key Infrastructure.PGL Graphics (file name extension) PL Plus[Hewlett-Packard].PL Perl Language (file name extension)PGM ProgramPLA Programmable Logic-ArrayPGML Precision Graphics Markup Language PLATO Programmed Logic for AutomaticPGP Pretty Good Privacy (name ofTeaching Operationsencryption program)PLC Power Line Communications +.PGP ProGram Parameter (file nameProgrammable Logic Controllerextension) [AutoCAD]PLCC Plastic Leadless Chip CarrierPGUP Page UpPLD Programmable Logic DevicePHF Perfect Hash FunctionPLDS Pilot Land Data System [NASA]PHIGS Programmers' Hierarchical Interactive PLL Phase Locked LoopGraphics.PLL Prelinked Library (file nameStandardsextension) [Clipper].PHO Phone List (file name extension) PL/M Programming Language for MicrosPHP Personal Home Pages (original name of PLMN Public Land Mobile Networkthis programmingPLS Primary Link Stationlanguage, now known as PHP Hypertext PLSQL Procedural Language-Extensions to SQLPreprocessor)(Oracle)PHS Personal Handyphone SystemPLU Primary Logical UnitPI Program InterruptionPLV Production Level VideoPIA Peripheral Interface AdapterPL/1 * Programming Language OnePIC Personal Information Carrier +Personal Intelligent Communicator +Personal Internet Communicator +Platform for Internet Content +Priority Interrupt Controller +Program Interrupt ControllerPMManager.PM6[Corel]P-MAILPresentation Manager [IBM] +Preventative Maintenance + ProcessPagerMaker6 (file name extension)Paper MailPICSPlatform for Internet ContentPILOT Programmed Inquiry Learning OrTeachingPilotACE* Pilot Automatic Computing EnginePIM Personal Information Manager +Primary Interface Module +Protocol-Independent MulticastPIN Personal Identification Number +Process Identification Number [Unix]PINE Pine Is Not Elm (original usage) +Program for Internet News & EmailPMDPacket Mode Data

PMMU Paged Memory Management Unit[Microsoft]PMOS Positive Channel Metal OxidePPTP Point-to-Point Tunneling ProtocolSemiconductor[Microsoft]PMP Personal Media Player +Portable Multimedia PlayerPPUPQAPlace of Primary UsePalm Query ApplicationPMR Problem Management Report [IBM] PQFP Plastic Quad Flat PackPMU Performance Monitoring UnitPQO Parallel Query OptionPMS Policy Management SystemPRACSA Public Remote Access ComputerPN Processing NodeStandards AssociationP/N: Part NumberPRAM Parallel Random-Access Machine +PNA Programmable Network AccessParameter Random Access MemoryPND Position Navigation Device.PRC Pilot Resource (file name extension)PNG Portable Network Graphics[Palm Pilot]PNNI Private Network-to-Network Interface .PRD Printer Driver (file name extension)PNP Plug And Play +[Microsoft]Positive Negative Positive (bipolartransistor)PREPREPPreformatted [HTML]Power PC Reference PlatformPNP-X Plug And Play Extensions[IBM/Motorola]PO Parity OddPRF Pulse Repetition FrequencyPOA Portable Object Adapter.PRF Preferences (file name extension)POC Point Of Contact[Grammatik IV]POC-IT Point Of Care-Information Technology .PRG Program (file name extension)[Johns Hopkins]PRI Primary-Rate InterfacePOD Piece Of Data + Plain OldPRINTF Print with Formatting [C ProgrammingDocumentation [Perl] +Plain Old Dos + Publishing On DemandLanguage]PRISM Photo-Refractive Information StoragePOE Power Open EnvironmentMaterialPOH Power-On Hours.PRJ Project (file name extension)POI Point Of Interest[Borland]POL Problem Oriented LanguagePRMD Private Management Domain [X.400]POP Picture-Outside-Picture + Point Of PRML Partial-Response Maximum-LikelihoodPresence +.PRO Professionals (Domain Name)Pop from Stack + Post Office Protocol [Internet] +POP3 Post Office Protocol, Version 3Profile (file name extension)POPA Pop All RegistersPROC ProcedurePOPF Pop FlagsPROFS Professional Office System [IBM]POR Power-On-ResetPROG Program + ProgrammerPOS Packet Over Sonet + Point of Sale + PROLOG Programming In Logic (ProgrammingPositive +Language)(See HLL)Programmable Object SelectPROM Programmable Read Only MemoryPOSE Palm Operating System Emulator PRN PrinterPOSIX Portable Operating System Interface PRNG Pseudo-Random Number Generationfor Unix(algorithm)POST Power-On Self Test.PRS Printer (file name extension)POSTNET Postal Numeric Encoding Technique [WordPerfect](bar code)PRTSC Print ScreenPOTS Plain Old Telephone Service + Plain PS Proportional SpacingOld Time-Sharing.PS PostScript (file name extension)POWER Performance Optimization withPS/2 Programming System 2 [IBM]Enhanced RISC [IBM]PSAPI Presentation Space ApplicationPowerPC Performance Optimization withProgramming InterfaceEnhanced RISC-PerformancePSC Personal Super Computer + PrintComputingServer Command +PP Parallel PortProduct Service CenterP2P Peer To Peer + People To People PSDN Packet-Switched Data NetworkP3P Platform for Privacy Preferences PSDS Packet-Switched Data ServicePPA Pixel Processing AcceleratorPSERVER Print Server [NetWare].PPD PostScript Printer Description (file PSF Permanent Swap Filename extension)PSID PostScript Image DataPPDS Personal Printer Data Stream [IBM] PSINET (formerly Performance SystemsPPGA Plastic Pin Grid ArrayInternational)PPI Precise Pixel InterpolationPSK Phase Shift KeyingPPM Pages Per MinutePPML Personalized Print Markup LanguagePPP Point-to-Point Protocol [Internet]PPPOE (PPPoE) Point-to-Point Protocol OverEthernetPPS Packets Per Second + Power PersonalSystems [IBM].PPS PowerPoint Show (file name extension)PSM Platform Specific Model + PrintingSystems Manager +Print Services Facility [IBM]PSN Packet Switching Network +Processor Serial NumberPSP[IBM] +Personal Software Products (group)Play Station Portable [Sony] +

Program Segment Prefix.QDT Quicken Data (file name extension)PSPDN Packet-Switched Public Data Network [Intuit]PSRAM Pseudo-Static Random Access Memory QEMM Quarterdeck Expanded Memory ManagerPSRT PostScript Round Table [GEnie] [Quarterdeck Corp.]PSS Process Status StructureQFA Quick File AccessPSTN Public Switched Telephone Network QFE Quick-Fix Engineering [Microsoft]PSU Power Supply UnitQFP Quad Flat PackPSW Program Status WordQIC Quality Information Using Cycle Time.ps.Z Compressed PostScript (file name [Hewlett-Packard] +extension) [Unix]Quarter-Inch CartridgePT Page Table.QIF Quicken Import File/InterchangeP/T Part TimeFormatPTD Parallel Transfer Disk Drive(file name extension)PTE Page Table EntryQLLC Qualified Logical Link ControlPTF Problem Temporary/Trouble Fix [IBM] .QMT Quicken Memorized List (file namePTH Plated Through Holeextension) [Intuit]PTI Packet Type Identifier.QNX Quicken Indexes to Data (file namePTT Postal Telephone & Telegraph + Push extension) [Intuit]To TalkQOS Quality Of ServicePUB Public (directory) [Internet] + QPG Quantum Phase GatePublishQPSK Quadrature Phase Shift Keying.PUB Publication (file name extension) QSAM Queued Sequential Access Method[Ventura]QTC Quicktime Conferencing [Macintosh]PUN Physical Unit NumberQTVR Quicktime Virtual RealityPUP PARC Universal Packet (protocol) + QVGA Quarter Video Graphics ArrayPotentially Unwanted ProgramQWAVE Quality Windows Audio/VideoPURL Persistent URLExperience [Microsoft]PUS Processor Upgrade SocketPUSHA Push All RegistersPUSHF Push FlagsPVC Permanent Virtual Circuit + Polyvinyl R...ChloridePVM Parallel Virtual Machine +Pass-through Virtual Machine(protocol) [IBM]| TOP | UP to Q | DN to S | BOTTOM |PVP Parallel Vector ProcessingRA Remote Assistance + ReturnPVR Personal Video RecorderAuthorizationPVS Parallel Visualization Server.RA Real Audio (file name extension)PVT Position, Velocity, TimeRACF Resource Access Control FacilityPW PasswordRAD Rapid Application DevelopmentPWB Printed Wire Board +Programmer's Workbench [Microsoft]RADAR Radio Detection And Ranging +Rights, Availabilities, DistributionPWD Print Working Directory [Unix] Analysis.PWL Password List (file name extension)and Reporting [Disney]PWM Pulse Width ModulationRADB Routing Arbiter Data BasePWR PowerRADIUS Remote Authentication Dial-In UserPWSCS Programmable WorkstationServiceCommunication Services [IBM]RADSL Rate Adaptive Digital Subscriber Line.PX Primary Index (file name extension) RAG Row Address Generator[Paradox]RAID Redundant Arrays of Independent Disks+Redundant Arrays of IndependentDrives +Q...Redundant Arrays of Inexpensive DisksRAIS Redundant Arrays of InexpensiveSystems| TOP | UP to P | DN to R | BOTTOM | RALU Register Arithmetic Logic UnitRAM Random Access MemoryQA Quality Assurance.RAM Real Audio Metafile (file nameQAM Quadrature Amplitude Modulation extension)QBE Query By ExampleRAMDAC Random Access Memory Digital-to-QBF Query by FormAnalogQBIC Query By Image Content [IBM]Converter [Sierra]QBITS Quantum BitsRAMP Remote Access Maintenance ProtocolQC Quality Control[Internet]QD Querty/DvorakRAN Radio Access Network + RegionalQDA Qualitative Data AnalysisAdvanced NetworkQDOS Quick and Dirty Operating System RAND Random.QDI Quicken Dictionary (file nameRAP Rapid Application Prototypingextension) [Intuit]RARP Reverse Address Resolution Protocol

RAS Random Access Storage +RES Remote Execution Service + Reset +Reader Admission System [British ResolutionLibrary] +.RES Resource (file name extension)Reliability, Availability andRET Resolution Enhancement TechnologyServiceability +[HP] + ReturnRemote Access Service + Row Address RETR RetrieveSelectREX Relocatable ExecutableRASAPI Remote Access Service Application REXEC Remote ExecutionProgrammingREXX Restructured Extended ExecutorInterface [Microsoft](language) [IBM].RAT Rating (file name extension)RF Radio FrequencyRAVE Rendering Acceleration Virtual Engine RFC Request For Comments [Internet][Apple Computer]RFD Reduced Function Device +.RAW Raw Data (file name extension)Request for Discussion [Internet]RB Right Button (of 2 or 3 button Mouse) RFI Radio Frequency Interference +RBBS Remote Bulletin Board SystemRequest for InformationRBCS Remote Bar Code SystemRFID Radio Frequency IdentificationRBOC Regional Bell Operating Company RFP Request for Proposal.RC Resource (file name extension) RFQ Request for QuotationRC1 Release Candidate 1 [Microsoft] RFS Remote File Sharing + Remote FileRCD Redistribution Control Descriptor SystemRCL Rotate Carry LeftRFT Reliable File Transfer +RCP Remote Control Panel + Remote CopyRevisable Form Text + Rich Text[Internet] +FormatRestore Cursor Position + Rich Client RFU Reserved For Future UsePlatformRGB Red-Green-Blue (color model)RCPT RecipientRI Referential Integrity + Ring IndicateRCR Rotate Carry RightRID Relative IdentifierRCS Records Communications Switching RIFF Resource Interchange File FormatSystem +[Microsoft]Revision Control System [Unix] RIM Remote Installation and MaintenanceRD Receive Data + Remove Directory [Microsoft] +R&D Research and DevelopmentResearch In Motion (company) + RingRDA Remote Database AccessIndicator MonitorRDB Receive Data Buffer + Relational RIME RelayNet International MessageDatabaseExchangeRDBMS Relational Database Management System RIP Raster Image Processor + RemoteRDCLK Received Timing ClockImaging Protocol +RDF Resource Description Framework [W3C]Routing Information Protocol [Novell]RDIF Radio Frequency Indentification (tag) RIPEM Riordan's Internet Privacy EnhancedRDN Relative Distinguished NameMailRDO Remote Data ObjectRIPS Raster Image Processing SystemRDP Reliable Datagram Protocol + Remote RISC Reduced Instruction Set ComputingDesktop ProtocolRIT Raw Input Thread [Microsoft]RDR Remote Data RecoveryRJE Remote Job EntryRDRAM Rambus DRAMRLD Received Line DetectRDSL (See DSL)RLE Run Length EncodedRDSR Receiver Data Service RequestRLL Run Length LimitedRDTO Receive Data Transfer Offset [IBM] RLN Remote LAN Node [DCA]RDX Realistic Display MixerRLOGIN Remote Login.REC Recorder (file name extension) + RLSD Received Line Signal DetectedRecreational or EntertainmentRLSI * Ridiculously Large-Scale IntegrationActivities (DomainRM Reset ModeName) [Internet]RMA Return Material Authorization +REC. Recreation [USENET NewsgroupReturn to Manufacturer AuthorizationCategory]RMB Right Mouse Button.REF Reference (file name extension) RMC Raptor Management Console [Symantec]REG RegisterRMDIR Remove DirectoryREGAL Rigid Epoxy Glass Acrylic Laminate RMI Remote Messaging Interface +REGEDIT Registry Editor [Microsoft]Remote Method Invocation [Sun]RELSECT Relative SectorRMON Remote Monitor/MonitoringREM Remark + Remote + Ring Error Monitor RMP Remote Maintenance Processor [IBM]REN Rename + Ringer Equivalence Number RMS Record Management Services + RootREP RepeatMean SquareREPE Repeat while EqualRMW Read-Modify-WriteREPNE Repeat while Not EqualRN Read News [Internet]REPNZ Repeat while Not ZeroRNA Remote Network Access [Microsoft]REPZ Repeat while ZeroRNC Radio Network ControllerREQ RequestRND RandomREREG Re-RegisterRNG Random Number Generator

RNP Regional Network ProviderRTCP Real-Time Control ProtocolR-O Read OnlyRTDM Real-Time Data MigrationROB Reorder Buffer [Intel]RTEL Reverse Telnet [Internet]ROI Return On InvestmentRTF Rich Text FormatROL Rotate LeftRTI Run Time InfrastructureROLAP Relational On-Line AnalyticalRTL Raster Transfer Language +ProcessingRegister Transfer Language/Level +ROM Read Only MemoryResistor Transistor Logic + Right-To-ROOM Real-Time Object-Oriented Modeling Left +ROP Raster Operation + RISC OperationRun Time LibraryROPES Rapid Object-Oriented Process for RTM Release To Manufacturer + ResponseEmbedded SystemsTime Monitor +ROR Rotate RightRuntime Manager [Borland]ROS Read-Only Storage [IBM]RTMP Routing Table Maintenance ProtocolROSCOE Remote Operating SystemRTN Reuters Transaction NetworkConversational OnlineRTOS Real-Time Operating SystemEnvironmentRTP Rapid Transport Protocol + Real TimeROT Running Object TableProtocol +RPC Remote Procedure CallReal-Time Transport ProtocolRPE Remote Program ExecutionRTS Remote Takeover System +RPG Report Program Generator (Programming Ready/Request To SendLanguage)RTSP Real-Time Streaming ProtocolRPL Resident Programming Language + RTTI Runtime TypeRequested Privilege LevelIdentification/InformationRPM Revolutions Per MinuteRTTY Radio Teletypewriter (Communications)RPN Real Page Number + Reverse Polish RTV Real Time VideoNotationRTX Run Time ExtensionRPRINTER Remote Printer [NetWare]RUN Rewind/Unload [IBM]RPPROM Reprogrammable PROMRUP Rational Unified Process [IBM]RPR Relative Performance RatingRVA Relative Virtual AddressRPT RepeatRVI Reverse InterruptRPQ Request for Price QuotationR/W Read/WriteRQBE Relational Query By Example [Fox Pro] RWIN Receive WindowRR Real RealityRWM Read-Write MemoryRRP Recommended Retail PriceRX ReceiverRS Radio Shack +RXD Receive DataRecommended Standard (as in RS-232)[EIA] +Record Separator + Request to SendRSA Rural Service AreaRSA129 (129 digit cryptographic securityS...number named afterits inventors: Drs. Ronald L. Rivest,| TOP | UP to R | DN to T | BOTTOM |Adi Shamir andLeonard M. Adleman)SA Selective AvailabilityRSAC Recreational Software Advisory SAA Systems Application ArchitectureCouncil[IBM]RSCS Remote Spooling Communications System SAAS Software As A ServiceRSD Route Server DaemonSABRE Semi-Automatic Business ResearchRSH Remote ShellEnvironmentRSI Repetitive Strain Injury (Carpal SAC Single Attachment ConcentratorTunnel Syndrome)SACD Super Audio Compact DiskRSL Request-and-Status LinkSACL System Access Control ListRSP Required Space Character + Response SADL Synchronous Data Link Control [Racal-RSPX Remote Sequenced Packet Exchange Vadic]RSS Really Simple Syndication + Reduced SAINT * Symbolic Automatic IntegratorSpace Symbology +SAL Shift Arithmetic Left + SpatialRDF Site Summary + Rich Site Summary Aggregation Language +RSSI Received Signal Strength IndicatorSysten Abstraction LayerRST Reset + RestartSALT Speech Application Language TagsRSTS Resource Sharing Time SharingSAM Serial Access Memory + Sequential[Digital]RSVP Resource Reservation ProtocolAccess Method +Security Accounts Manager [Microsoft]RSX Realistic Sound Experience +Real Time Resource Sharing Executive+Single Application Mode [Microsoft]RT Real Time + RISC Technology + Run SAMI Synchronized Accessible MediaTimeInterchangeR/T Receive/TransmitSAML Security Assertion Markup LanguageRTAM Remote Terminal Access MethodSAN Storage/System Area NetworkRTC Real-Time ClockSANE Standard Apple Numeric Environment

SAP Second Audio Program + Service Access Format [Lotus] +Point [DEC] +Session Announcement Protocol +Service Advertising Protocol +Software Configuration Management +Station Class Mark +Supply Chain Management* Symbolic Assembly Program +SCO Santa Cruz Operation (SoftwareSystems, Applications and Products(company) [SAP]Company) +Synchronous Connection-OrientedSAPI Speech Application Program Interface (link)[Microsoft]SCOPE Simple Communications ProgrammingSAR Segmentation and Reassembly +Shift Arithmetic Right + SpecificEnvironment[Hayes]Absorption RateSCP Save Cursor Position + SubsystemSuccessive Approximation Register +Synthetic Aperature RadarControl Port +System Control ProgramSARG Search ArgumentSCR Silicon Controlled RectifierSARS Severe Acute Respiratory Syndrome .SCR Script (file name extension)(virus)SCRAM Software Configuration, Release andSAS Sales Accounting System + Serial ManagementAttached SCSI +SCRAMJET Supersonic Combustion Ramjet (engine)Single Attached Station + SingleAudio System +Statistical Analysis SystemSCRNSCRSSCSAScreen (video display)Scalable Cluster of RISC SystemsSignal Computing System ArchitectureSASI Shugart Associates System Interface [Dialogic](SCSI originatedfrom SASI)SCSISCTPSmall Computer Systems InterfaceStream Control Transmission ProtocolSATA Serial Advanced Technology Attachment SD Send Data + Secure Digital + SuperSATAN Security Administrator Tool for DensityAnalyzing NetworksSDA Software Delivery Agent [IBM] +.SAV Saved (file name extension)Software Disk Array +SAVDM Single Application VDMSource Data Automation + SystemSAX Simple API for XMLDisplay Architecture [Digital]SB Sound Blaster [Creative Labs] + Sound SDAM Single DOS Application ModeBoardSDB Symbolic Debugger [Unix]SBA Scene Balance Algorithms [Kodak] + SDD Software Description DatabaseService Based Architecture[Internet] +SBAS Satellite Based Augmentation SystemSubscriber Data Document +SBB Subtract With BorrowSystem Distribution DirectorySBC Single-Board ComputerSDF Space Delimited File + SpaceSBCS Single-Byte Character SetDelimited FormatSBI Sound Blaster Instrument.SDF Standard Data Format (file name.SBR Source Browser (file name extension) extension)[Borland]SBS Small Business Server +SDHSDISynchronous Digital HierarchySelective Dissemination ofSmart Battery Specification[Duracell/Intel]Information +Single Document Interface.SC Script (file name extension)Software Development InterfaceSCA Scalable Computing Architecture [HP] [Mosaic]+SDIO Secure Digital Input/OutputService Component Architecture SDK Software Development Kit [Microsoft]SCADA Supervisory Control and DataSDL Specification and DescriptionAcquisitionLanguageSCAM SCSI Configuration Automatically SDLC Synchronous Data Link ControlSCAS Scan String(protocol)SCB Subsystem Control Block [IBM]SDLT Super Digital Linear TapeSCC Serial Communications Controllers +Serial Controller Chip +SDMSDMISystem Development MultitaskingSecure Digital MusicSynchronous Channel Check [IBM] Initiative/InterfaceSCCP Simple Conference Control Protocol SDMMC Secure Digital Multi Media CardSCCS Source Code Control SystemSDMS SCSI Device Management System [NCR]SCD Standard Color DisplaySDN Software Defined Network [AT&T]S-CDMA Synchronous Code-Division MultipleAccessSCF System Control FacilitySCI Scalable Coherent Interface +Serial Communications InterfaceSCI. Science [USENET Newsgroup Category]SCIL Serial Control Interface LogicSCLM Software Configuration and LibraryManagement [IBM]SCM Service Control Manager + ScreenCamSDNS Secure Data Network ServiceSDO Service Data Objects +Software Delivery Optimization[Borland]SDRSDRAMSD-ROMSDSSDSLSDSMStreaming Data RequestSynchronous DRAMSuper Density ROMSysops Distribution System(See DSL)Super Digital Sound Management

SD_STB Streaming Data Strobe [IBM]SHL Shift Logical LeftSDTV Standard Definition Television SHOE Simple HTML Ontology ExtensionSDV Segment Delay Value + Switched SHR Shift Logical RightDigital Video [AT&T]SHTML Server-Side Include HyperText MarkupSDX Storage Data AccelerationLanguageSDXF Structured Data Exchange Format S-HTTP Secure Hypertext Transfer ProtocolSEA Standard Extended Attribute [OS/2] SHV Standard High-Volume.SEA Self Extracting Archive (file name .SHW Show (file name extension)extension) [Macintosh]SI Shift-In + Source Index + SystemSEAC * Name of first computer to useInformation +transistors, built bySystem Integration(National Bureau of) Standards SIC Standard Industrial CodeEastern AutomaticSID Security Identifier + Serial InputCalculator (Also see SWAC)Data +SEAL Segmentation and Reassembly LayerStation Identification [AT&T] +(protocol) +Symbolic Interactive Debugger +Screening External Access Link[Digital-DEC]System IDSIDF System Independent Data FormatSEC Single Error CorrectionSIDH System Identification for HomeSECAM Sequentiel Couleur Avec Memoire(Sequential Color With Memory)SystemsSIDT Store Interrupt Descriptor TableSECC Single Edge Contact CartridgeSIF Standard Input FormatSED Stream Editor + Stream-Oriented SIFT Stanford Information Filtering ToolEditorSIG Special Interest GroupSEG SegmentSIGCAT Special Interest Group on CD-ROMSEH Structured Exception HandlingApplicationsSEL Selectand TechnologySEM Scanning Electron Microscope + SIM Simulator + Subscriber IdentityStandard Electronic Module +ModuleStrategic Enterprise Management [SAP] SIMCARD Subscriber Identity Module CardSEO Search Engine OptimizationSIMD Single Instruction, Multiple DatastreamSEPP Secure Encryption Payment Protocol(processor)SER SerialSIMM Single In-line Memory ModuleSERCOS Serial Real-Time Communications SIMTEL Simulation and TeleprocessingSystemSIMULA Simulation (language)SERPS Search Engine Results Page [Google] SIO Serial Input/Output (communicationsSET Secure Electronic Transaction +Softwave Engineering Technologydriver)SIP Session Initiation Protocol + Single.SET Driver Set (file name extension) In-line Package[Lotus 1-2-3] [LDC] +SIPC Simply Interactive Personal ComputerImage Settings (file name extension) [Microsoft][Paradox]SIPO Serial In, Parallel OutSETEXT Structure Enhanced Text [Internet] SIPP Single In-line Pin PackageSEU Single Event Upset + SmallestSIR Serial Infrared [Hewlett-Packard]Executable UnitSIRDS Single-Image Random Dot StereogramSF Sign FlagSIS Single-Image StereogramSFC System File CheckerSISL System Interrupt Steering LogicSFD Start Frame DelimiterSISNET Signal In Space Through The InternetSFDR Spurious-Free Dynamic RangeSI/SO Serial In/Serial Out + Shift In/ShiftSFI Software Fault IsolationOutSFN Short File NameSIT Special Information TonesSFQL Structured Full-text Query Language .SIT Stuff-It (compressed file nameSFS System File Serverextension) [Macintosh]SFT System Fault ToleranceSIU System Interface UnitSFX Self Extracting + Sound Effect(s) SIV System Integrity VerifierSGA Shared Global AreaSKIP Simple Key-Management for InternetSGCP Simple Gateway Control Protocol Protocols [Sun]SGEN Signal Generator + System Generator SKU# Stock Keeping Unit NumberSGDT Store Global Descriptor TableSLA Service Level AgreementSGI Silicon Graphics, Inc.SLB Static Load BalancingSGM Shaded Graphics ModelingSLC Subscriber Line ConcentratorSGML Standard/Structured Generalized SLD Second-Level Domain (name)Markup LanguageSLDT Store Local Descriptor TableSGR Set Graphics RenditionSLED Single Large Expensive DiskSGRAM Synchronous Graphics RAMSLI Session Level InterfaceS/H Sample and HoldSLIC System Level Integration Circuit +SHA Secure Hash Algorithm [NSA]System Licensed Internal Code [IBM]SHAR Shell ArchiveSLIM Structured Language for InternetSHED Segmented Hypergraphic EditorMarkupSHG Segmented HypergraphicsSLIP Serial Line Interface Protocol

SLM Spatial Light ModulatorSNP Serial Number/Password [OmenSLMR Silly Little Mail ReaderTechnology]SLOSH Sea, Lake and Overland Surge from SNR Signal-to-Noise RatioHurricane (program)SNRM Set Normal Response ModeSLOT Scanned Laser Output TerminalSOA Service-Oriented Architecture + StartSLP Service Location Protocol + Super Of AuthorityLong PlaySLR Single Lens ReflexSOAPSOCSimple Object Access ProtocolSystem On a ChipSLSI Super Large-Scale IntegrationSOC. Social Issues [USENET NewsgroupSLSS Systems Library Subscription Service Category][IBM]SOCKS Socket Secure (server) [Internet]SLU Secondary Logical Unit + Spoken SO-DIMM Small Outline DIMMLanguage UnderstandingSOE Standard Operating EnvironmentSM Set Mode + Shared MemorySOH Start of HeaderSMA Software Migration Assistant [IBM] SOHO Small Office/Home OfficeSMART Self-Monitoring Analysis andSOI Silicon-On-Insulator [IBM]Reporting TechnologySOIC Small Outline Integrated CircuitSMB Server Message Block (protocol) SOJ Small-Outline J-LeadSMD Surface Mounted DeviceSOL Simulation Oriented LanguageSMDR Station Message Detail Recording SOM Start of Message + System ObjectSMDS Switched Multimedia/Multi-Megabit Model [IBM]Data ServiceSONAR Sound Navigation and RangingSME Small & Medium Sized Enterprises SONET Synchronous Optical NetworkSMF Single Mode Fiber + System Manager SOP Small Outline Package + StandardFacility [Compaq]Operating ProceduresSMI System Management Interrupt [Intel] SOS Silicon On Sapphire + SophisticatedSMIF Standard Mechanical InterfaceOperating System +SMIL Synchronized Multimedia IntegrationStandards and Open SystemsLanguageS-MIME Secure MIMESOTASOXState Of The ArtSound ExchangeSMIT System Management Interface Tool SP Service Pack [IBM] + Stack Pointer +[IBM]System ProductSMK Software Migration Kit [Microsoft] SPA Secure Password AuthenticationSML Standard Meta Language[Microsoft] +SMM System Management Mode [Intel]Software Publishers AssociationSMOBC Solder Mask Over Bare CopperSPAN Space Physics Analysis NetworkSMP Simple Management Protocol + Symbolic SPAP Shiva Password AuthentificationManipulationProgram + Symmetrical Multi-Processing +Symmetric MultiprocessorProtocolSPARCSPCScalable Processor Architecture +Sun's Palo Alto Research CenterSmall Peripheral Controller +.SMP Sample (file name extension)Statistical Process ControlSMPC Shared Memory Parallel Computer SPCL Spectrum Cellular CorporationSMPS Switching Mode Power SupplySPCS Stored Program Controlled SwitchSMRAM System Management Random Access SPD Serial Presence DetectMemorySMS Short Message Service [Sprint] +SPESPECSynergistic Processing ElementSystems Performance EvaluationShort Messaging System +CooperativeStorage Management Services [NetWare] SPF Sender Policy Framework + Shortest+Path First +Storage Management Subsystem/System +Systems Management Server [Microsoft] SPGASystem Programming FacilityStaggered Pin-Grid ArraySMSW Store Machine Status WordSMT Station Management (protocol) +Surface-Mount TechnologySMTP Simple Mail Transfer ProtocolSMU System Management UtilitySN Serial NumberS/N Signal-to-Noise (Ratio)SNA Systems Network Architecture [IBM]SNAP Sub-Network Access Protocol +Sub-Network Attachment PointSNAPI Structured N-Dimensional ApplicationProgramInterface [Oracle]SND SoundSNEWS Secure News Server [Internet]SNMP Simple Network Management ProtocolSNOBOL String Oriented Symbolic Language(Programming Language)SPI Security Parameters Index + ServiceProvider Interface +SCSI Parallel Interface + StatefulPacket Inspection.SPI Spool (file name extension)SPID Service Profile/Provider IdentifierSPIKE Science Planning IntelligentKnowledge-BasedEnvironment [STScI]SPIRES Stanford Public Information RetrievalSystem[Stanford University]SPKI Simple Public Key InfrastructureSPL Software Product Line + Spooler +Structured Product Labeling[Microsoft] +System Programming Language [HP].SPLSpell Checker (file name extension)

SPLD Simple Programmable Logic Device SSML Speech Synthesis Markup LanguageSPM System Performance Monitor [IBM] [W3C]SPOOL Simultaneous Peripheral Operations On SSO Single Sign OnLineSSPI Security Service Provider InterfaceSPOT Shared Product Object Tree [IBM] + [Microsoft]Small Programmable Object Technology SSR Secure Socket Relay[Sun] +SSRP Simple Server Redundancy ProtocolSmart Personal Object Technology[Microsoft][Cisco]SST Spread-Spectrum Technology +SPP Sequenced Packet Protocol + StandardSystems Services and TechnologyPrinter PortSTA Spanning Tree AlgorithmSPPS Scalable Power Parallel System [IBM] STAR Self Defining Text ArchivalSPR Special Purpose Register +STAX (StAX) Streaming API for XMLStatistical Pattern Recognition + STB StrobeSymmetrical Phase RecordingSTC Set Carry FlagSPREAD * Systems Programming, Research, STD Set Direction Flag + StandardEngineeringSTDA StreetTalk Directory Assistanceand Development [IBM][Banyan]SPS Secure Packet Shield + ShockSTDAUX Standard AuxilaryProtection System +STDERR Standard ErrorStandby Power SystemSTDIN Standard InputSPSS Statistical Package for the Social STDIO.H Standard Input/Output Header [CSciencesProgramming Language]SPT Sectors Per TrackSTDM Statistical Time Division MultiplexerSPVA Super Patterned Vertical Alignment STDOUT Standard OutputSPX Sequenced Packet Exchange [Novell] STDPRN Standard PrinterSQ Squeezed (files)STEM Science, Technology, Engineering andSQE Signal Quality Error (test)MathSQL/DS Structured Query Language/Data System STEP Standard for Exchange of Product[IBM]STEREO Solar-Terrestrial RelationsSQOS Secure Quality Of ServiceObservatory [JHUAPL]SQRT Square Root.STF Structured File (file name extension)SR Shift Register[Lotus Agenda]SRAM Shadow Random Access Memory +STI Set Interrupt FlagStatic Random Access MemoryS/TK Sectors Per TrackSRAPI Speech Recognition APISTL Standard Template LibrarySRB Source-Route BridgeSTM Scanning Tunneling MicroscopeSRC System Resource ControllerSTN Super-Twist Nematic.SRC Source (file name extension).STORE Businesses Offering Goods (DomainSRD Screen Reader SystemName) [Internet]SRDRAM Self-Refreshed DRAMSTOS Store StringSRGB Sustained RGB (values)STP Secure Transfer Protocol + ShieldedSRGS Speech Recognition GrammarTwisted Pair (cable) +Specification [W3C]Signal Transfer Point +SRM Security Reference MonitorSynchronized Transaction ProcessingSRO Sharable and Read OnlySTR Store Task Register + SynchronousSRP Suggested Retail PriceTransmitter Receiver.SRP Script (file name extension)STRESS Structural Engineering System SolverSRPI Server-Requester Programming(ProgrammingInterfaceLanguage)SRQ Service RequestSTRUDL Structural Design LanguageSRR Serially Reusable Resource(Programming Language)SRS Sound Retrieval SystemSTScI Space Telescope Science InstituteSS Stack Segment + Single Sided + STT Secure Transaction TechnologySeconds[Microsoft]SS7 Signaling System 7 [Bellcore]STX Start of TextSSA Serial Storage Architecture.STY Style (file name extension) [Ventura,SSAD Structured System Analysis and Design Word, WordPerfect]SSAP Source Service Access PointSUB Subroutine + Substitute + SubtractSSCP Systems Service Control Point [IBM] SUN Sun Microsystems, Inc.SSD Solid State Disk.SUP Supplemental Dictionary (file nameSSEC * Selective Sequence Electronicextension)Calculator [IBM][WordPerfect]SSGA System Support Gate ArraySUPERDARN Super Dual Auroral Radar NetworkSSH Secure Shell (protocol)[JHUAPL]SSI Server Side Includes + Single System SVC Switched Virtual CircuitImage +SVCD Super Video Compact DiskSmall Scale IntegrationSVF Simple Vector FormatSSL Secure Socket LayerSVG Scalable Vector GraphicsSSMA Spread Spectrum Multiple Access SVGA Super Video Graphics Array

S-VHS Super VHSAccess SystemS-VIDEO Separate VideoTASM Turbo Assembler [Borland]SVM System Virtual Machine [Microsoft] + TAXI Transparent AsynchronousSystem Volume MangementTransceiver/Receiver InterfaceSVN Switched Virtual Network [IBM] TB Terabyte (1,024 gigabytes)SVR Server(One Thousand Billion characters ofSVR# System V Release Number [AT&T] information)SVTC Secure VideoteleconferenceT/B Top and BottomS/W SoftwareTBBS The Bread Board System (BBS)SWAC * Mobile version of SEAC, built for TBGA Tape Ball Grid Arraydeployment to White.TBK Toolbook (file name extension)Sands, and named Standards Western TBS Time-Based SamplingAutomatic CalculatorTBU Tape Backup UnitSWAIS Simple Wide Area Information Server TC Test Control + Transmission Control[Internet]TCL Tool Command LanguageSWAP Shared Wireless Access Protocol TCM Trellis-Coded ModulationSWIG Simplified Wrapper and Interface TCO Total Cost of OwnershipGeneratorTCP Tape-Carrier PackageSWISH Simple Web Indexing System for Humans TCPA Trusted Computing Platform AllianceSWP Simple Web Printing[Intel].SWP Swap (file name extension)TCP/IP Transmission ControlSXGA Super Extended Graphics ArrayProtocol/Internet ProtocolSXRD Silicon Crystal Reflective Display TCT Terminal Control Table.SYL Syllabus (file name extension) TD Transmit DataSYLK Symbolic Link.TDA To Do Archive (file name extension).SYM Symbols (file name extension)[Palm]SYMPL Systems Programming LanguageTDC Tabular Data Control.SYN Synonym (file name extension)TDD Telecommunications Device for theSYNC SynchronousDeaf +SYS SystemTest Driven Development.SYS System Configuration (file name TDtoDP Tablet Coordinates to Displayextension) +System Device Driver (file nameCoordinates(converting)extension)TDE Terminal Display EditorSYSADMIN System Administrator.TDF Trace Definition File (file nameSYSGEN System Generatorextension) [OS/2] +SYSLOG System LogTypeface Definition File (file nameSYSMOD System Modificationextension)SYSOP System OperatorTDI Transport Device InterfaceSYSREQ System RequestTDM Technical Document Management +SZ Send ZModem [Unix]Time Division MultiplexingTDMA Time Division Multiple AccessTDMS Terminal Display Management SystemTDP Tag Distribution Protocol [Cisco] +T...Telelocator Data Protocol +Thermal Design PowerTDSR Transmitter Data Service Request| TOP | UP to S | DN to U | BOTTOM |TDR Time Domain ReflectometryTE/2 Terminal Emulator/2 [Oberon]TAB Tape Automated BondingTEB Thread Environment BlockTAC Title, Author, CopyrightTEC Tokyo Electronics CorporationTACS Total Access Communication System TED Technology, Entertainment and DesignTAD Telephone Answering Device+TAG Technical Advisory GroupTiny Editor + TransientTAI International Atomic TimeElectromagnetic DeviceTAL Typed Assembly LanguageTEI Terminal Endpoint IdentifierTALOSS Three-Dimensional AdvancedTELCO Telephone CompanyLocalizationTEML Turbo Editor Macro Language [Borland]Observation Submarine Software TEMP TemporaryTAO Track At OnceTER Thermal Eclipse Reading [Sony]TAP Telelocator Alphanumeric Protocol TERMPWR Terminator PowerTAPCIS The Access Program for the CompuServe TFDD Text File Device DriverInformation ServiceTFEL Thin-Film ElectroluminescentTAPI Telephony Applications Programming .TFM Tagged Font Metric (file nameInterfaceextension).tar Tape Archive (archived file name TFT Thin-Film Transistor (screens)extension) [Unix]TFTP Trivial File Transfer Protocol.tar.Z Compressed Archived files (file name .TGA Taga Bitmap (file name extension)extension) [Unix]THD Total Harmonic DistortionTAS Telephone Access Server + Total .THD Thread (file name extension)

THINNET Thin EthernetEST - Eastern Standard TimeTHOMAS The (U.S.) House (of Representatives) -5:00Open MultimediaGMT - Greenwich Mean TimeAccess System+0:00THOR Tandy High-Performance OpticalHST - Hawaii Standard TimeRecording-10:00THR Transmit Holding RegisterJST - Japanese Standard Time.THS Thesaurus (file name extension) +9:00TI Texas Instruments, Inc.MDT - Mountain Daylight TimeTIA Telecommunications Industry:::Association +MET - Middle European TimeThe Internet Adapter [Internet] +1:00TIB Tag Information BaseMST - Mountain Standard TimeTID Target ID + Task Identification -7:00TIES Time Independent Escape SequenceMTS - Moscow Time Standard.TIF Tagged Image File (filename+3:00extension)MTD - Moscow Time DaylightTIFF Tagged Image File Format:::TIGA Texas Instruments GraphicsNT - Nome TimeArchitecture-11:00TIGER Topologically Integrated GeographicNZT - New Zealand TimeEncoding+12:00and ReferencingPDT - Pacific Daylight TimeTIIAP Telecommunications and Information :::InfrastructurePST - Pacific Standard TimeAssistance Program [NII]-8:00TIL Tech Info Library [Macintosh]PST - Pakistan Standard TimeTIM Technical Information Memo [Compaq] +5:00TIMED Thermosphere-Ionosphere-MesosphereWAS - West Australian StandardEnergetics and Dynamics [JHUAPL] +7:00TIMEZONES - - - - - - - - - - - - - - - - - GMTWAT - West Africa TimeOffsets-1:00OffsetsWED - Western Europe DaylightEastward from GMT (+):::OffsetsWES - Western Europe StandardWestward from GMT (-)+0:00AST - Atlantic Standard TimeYDT - Yukon Daylight Time-4:00:::AT - Azores TimeYST - Yukon Standard Time-2:00-9:00AHD - Alaska-Hawaii DaylightIDLE- International Date Line East:::+12:00AHS - Alaska-Hawaii StandardIDLW- International Date Line West-10:00-12:00BLT - Baghdad Local TimeTIMI Technology Independent Machine+3:00Interface [IBM]BST - British Summer TimeTIMS Text Information Management Systems:::TINA Telecommunication InformationCAT - Central Alaska TimeNetworking Architecture-10:00TIP Terminal Interface Processor +CCT - China Coast TimeTransaction Internet Protocol+8:00TITOFET Tunneling-In, Tunneling-Out FieldCDT - Central Daylight TimeEffect Transistor:::TKIP Temporal Key Integrity ProtocolCET - Central European TimeTK/TK Track to Track+1:00TLA Three-Letter AcronymCLT - Cairo Local TimeTLB Translation Lookaside Buffer+2:00.TLB Table (file name extension)CST - Central Standard TimeTLD Top Level Domain-6:00TLI Transport Layer InterfaceEAD - East Australian Daylight TLS Transport Layer Security:::TLU Table LookupEAS - East Australian Standard .TLX Telex (file name extension)+10:00TM TrademarkEDT - Eastern Daylight TimeTMDS Transition Minimized Differential:::SignalingEET - Eastern European Time.TML Template (file name extension)+1:00TMP TemporaryEMT - Eastern MediterraneanTMS Traffic Management System [BA]+2:00TN Twisted Nematic

TNC Terminal Node ControllerTTS Text-To-Speech + Transaction TrackingTNEF Transport Neutral Encapsulation SystemFormatTTY TeletypeTNO The Netherlands OrganizationTUCOWS The Ultimate Collection of WinsockTOAD Tool for Application Developers SoftwareTOC Table Of ContentsTUI Text-Based User InterfaceTOD Time Of Day[WordPerfect]TOF Tiny Open FirmwareTUMS Table Update and Management SystemTOP Technical and Office Protocol[Stanford University]TOS Terms Of Service.TUT Tutorial (file name extension)TPC Transaction-Processing Performance TVF Table of contents Verbosely from FileCouncilTPF Transactions Processing Facility[UNIX]TVFS Toronto Virtual File System [IBM][IBM]TVI Television InterferenceTPI Tracks Per InchTVOL Television On-LineTPL Table Producing Language +TWAIN Technology Without Any InterestingTransaction Processing Language NameTPM Transactions Per Minute + Trusted(connection between application andPlatform Modulescanner software)TPORT Twisted Pair Port Transceiver [AT&T] TWEAKUI Tweak User InterfaceTP-PMD Twisted Pair-Physical MediumTWIP Twenty In Point (as in 20Dependent (cable)twips/pixel) [Microsoft]TPS Transactions Per Second +TWX Teletypewriter Exchange ServiceTransaction Processing SystemTXD Transmit DataTPW Turbo Pascal for Windows.TXF Tax Exchange Format (file nameTQFP Thin Quad Flat Packextension)TQM Total Quality ManagementTXT TextTR Terminal ReadyTXT2STF Text To Structured File [LotusT/R Transmit/ReceiveAgenda]TRACERT Trace Route [Microsoft]TZ Time Zone [Unix]TRADIC * Transistorized Airborne DigitalComputerentirely(Name of first computer to betransistorized)U....TRM Terminal (file name extension)TRN Threaded Read News [Internet] + Token| TOP | UP to T | DN to V | BOTTOM |Ring NetworkTRON The Real-Time Operating System UA User Agent + User AreaNucleusUAE Unrecoverable Application ErrorTS Top SecretUAM User Authentication MethodTSA Target Service Agent + Technical UART Universal AsynchronousSupport Alliance +Receiver/TransmitterTelephony Services Architecture UAS User Application SoftwareTSAPI Telephony Services Application UBE Unsolicited Bulk EmailProgramUBR Unspecified Bit RateInterface [AT&T + Novell].UC2 Compressed File (file name extension)TSB Termination Status Block[UltraCompressor]TSD Type-Specific DriverUCB Universal Content BrokerTSE The Semware EditorUCBE Unsolicited Commercial Bulk EmailTSID Transmitting SubscriberUCC Uniform Commercial CodeIdentification [Microsoft]UCE Unsolicited Commercial EmailTSN Transition Sequence NumberUCL Universal Communications LanguageTSO Time Sharing OptionUCS Unicode Conversion Support +TSOP Thin Small-Outline PackageUniversal Character Set +TSP Telephony Service ProviderUser Coordinate SystemTSR Terminate and Stay ResidentUCT Universal Coordinated TimeTSS Task State Segment + Time Sharing UDA Universal Data Access [Microsoft]SystemUDB Universal Data BaseTS/SI Top Secret/Sensitive Information UDC Universal Decimal Classification +.TST Test (file name extension)User Defined CommandsTSTN Triple Supertwisted NematicUDD User Data DocumentTSV Tab Separated ValuesUDDI Universal Description, Discovery andTT Typewriter TextIntegrationTTA Transport-Triggered Architecture UD-DVD Ultra-Definition Digital Video DiskTTCN Tree and Tabular Combined Notation UDE Universal Data Exchange.TTF TrueType Font (file name extension) UDEC * Universal Digital Electronic ComputerTTL Through The Lens + Transistor- [Burroughs]Transistor LogicUDF Universal Disk Format + User DefinedTTP Thermal-Transfer PrintingFunctions

UDG User Defined GatewayUSB Universal Serial Bus [Intel]UDMA Ultra Direct Memory AccessUS-CERT United States Computer EmergencyUDP User Datagram ProtocolReadiness TeamUDT Uniform Data Transfer + User-Defined USENET User's Network [Internet]TypeUSERID User IdentificationUEMS Unsolicited Electronic MailUSOC Universal Service Ordering CodeSolicitationUSQ Unsqueezed (files)UFS Universal\Unix File SystemUSR US Robotics (corporation)UG User GroupUSRT Universal SynchronousUHCI Universal Host Controller Interface Receiver/TransmitterUHF Ultra-High FrequencyUSSA User Supported Software AssociationUHL Universal Hypertext Link(United Kingdom)UI Unix International + User Interface UT User TerminalUIC User Identification CodeUT1 Universal Time OneUID User IdentifierUTC Coordinated Universal TimeUIMA Unstructured Information Management UTF Unicode Transformation FormatArchitecture [IBM]UTI Universal Text Interchange/InterfaceUIMS User Interface Management System UTM Unified Threat Management +UL Underwriters Laboratories +Universal Transverse Mercator (grid)Unordered List + UploadUTP Unshielded Twisted-Pair (cable)ULA Uncommitted Logic ArrayUU Uuencode/UudecodeULB Ultra WidebandUUCP Unix-To-Unix Copy ProtocolULN Universal Link NegotiationUUD UUDecoding [Unix]ULS Universal Licensing SystemUUDECODE Unix-To-Unix DecodingULSI Ultra Large Scale IntegrationUUE UUEncoding [Unix]UMA Unified Memory ArchitectureUUENCODE Unix-To-Unix EncodingUMB Upper Memory Block [LIM/AST]UUI User-To-User Information [AT&T]UMD Universal Media DiskUUID Universal Unique IdentifierUML Unified Modeling LanguageUV UltravioletUMPC Ultra-Mobile Personal Computer UWB Ultra-Wide BandUMS User Mode SchedulerUWR Ultra Wideband RadioUMTS Universal Mobile Telecommunications UXGA Ultra Extended Graphics ArraySystemUNC Universal Naming Convention +Uuencoded Netnews Collator [Unix]UNCOL Universal Computed Oriented LanguageUNEP Unbundled Network PlatformV...UNI User-Network InterfaceUNICOM Universal Integrated Communication(System)| TOP | UP to U | DN to W | BOTTOM |UNICOS Universal Compiler FORTRAN compatible VA Virtual Address + Visual Age [IBM]UNII Unlicensed National Information VAD Value Added DealerInfrastructureVADD Value Added Disk DriverUNIVAC Universal Automatic ComputerVADSL (See DSL)UNIX (AT&T Bell Laboratories Operating VAI Video As InputSystem)VAL Value + Voice Application LanguageUNMA Unified Network Management.VAL Validity Checks (file name extension)Architecture[Paradox]UNSPSC Universal Standard Products and VAM Virtual Access MethodServices ClassificationVAN Value Added NetworkUP UniprocessorVAP Value Added ProcessUPC Universal Product/Program Code + User VAR Value Added Reseller + Value AddedParameter ControlRetailer + VariableUPG UpgradeVAST Variable Array Storage TechnologyUPL User Program LanguageVAX/VMS Virtual Address Extension/VirtualUPM Unix Programmer's Manual +Memory System [DEC]User Profile Management [IBM]VB Variable Block + Visual BasicUPNP (UPnP) Universal Plug and Play [Microsoft]UPS United Parcel Service (company) + VBA Visual Basic for ApplicationsUninterruptible Power Supply/System [Microsoft]URC Uniform Resource Characteristics + VBE/AI Vesa Bios Extension/Audio InterfaceUniform Resource CitationVBI Vertical Blanking IntervalUREP Unix RSCS Emulation ProtocolVBNS Very High Speed Backbone Network(protocol)Service [MCI + NSF]URI Uniform Resource IdentifierVBR Variable Bit RateURL Uniform Resource LocatorVBRUN Visual Basic RuntimeURN Uniform Resource Name/NumberVBS Visual Basic ScriptUS Unit Separator.VBX Visual Basic Extension (file nameUSART Universal Synchronous-Asynchronous extension)Receiver/TransmitterVCC Virtual Channel Connection

VCD Video Compact Disk + VirtualVisual Interactive ParserCommunications DriverVIPER Verifiable Integrated Processor forVCI Virtual Circuit IdentifierEnhanced ReliabilityVCL Visual Class/Component Library VIS Video Information System [Tandy] +VCM Virtual Channel MemoryViewable Image Size +VCN Virtual Cluster NumberVisual Instruction Set [Sun] +VCOS Visual Caching Operating SystemVoice Information System[AT&T]VCPI Virtual Control Program InterfaceVJ HEADER Van Jacobsen Header (compression)[Unix]VCR Video Cassette RecorderVLA Variable-Length ArrayVDD Virtual Device DriverVLAN Virtual Local Area NetworkVDDM Virtual Device Driver ManagerVL-BUS Vesa Local-Bus [VESA]VDE Video Display Editor + VisualVLD Variable-Length DecoderDevelopment EnvironmentVLF Very Low FrequencyVDI Virtual Device InterfaceVLINK Visited Link [HTML]VDISK Virtual DiskVLIW Very Large Instruction WordVDM Virtual DOS Machine [IBM]VLM Virtual Loadable ModuleVDMAD Virtual Direct Memory Access Device VLSI Very Large Scale Integration[Microsoft]VLSIPS Very Large Scale Immobilized PolymerVDS Virtual DMA ServicesSynthesisVDSL (See DSL)VLT Variable List TableVDT Video Dial Tone + Video Display VM Virtual Machine + Virtual MemoryTerminalVMA Virtual Memory AddressVDU Video Display Unit + Visual Display VMB Virtual Machine BootUnitVMD Video Motion DetectionVEGA Video-7 Enhanced Graphics Adapter VME Versa Module Eurocard +[Video-7, Inc.]Virtual Memory EnvironmentVEMM Virtual Expanded Memory Manager VML Vector Markup Language [Microsoft]VEMMI Versatile Multimedia Interface VMM Virtual Machine/Memory ManagerVER Verify + VersionVMOS Vertical MOSVERONICA Very Easy Rodent-Oriented Net-Wide VMP Virtual Modem ProtocolIndex toVMS Virtual Machine Storage + VirtualComputer Archives [Internet]Memory System +VERR Verify Read AccessVoice Message SystemVERW Verify Write AccessVMT Virtual Memory TechniqueVES Video Encoding Standard [Oracle] + VNA Virtual Network ArchitectureVirtual Execution SystemVNC Virtual Network ComputingVESA Video Electronics StandardsVNOS Visual Network Operating SystemAssociationVOC Creative Voice (format) [SoundVF Virtual FloppyBlaster]VFAT Virtual File Allocation TableVOD Video On Demand[Microsoft]VOFDM Vector Orthogonal Frequency DivisionV.FC Version.First Class (communicationsMultiplexing [Cisco]standard)VOIP Voice Over Internet ProtocolVFD Vacuum Fluorescent DisplayVOL VolumeVFW Video For Windows [Microsoft]VOM Volt-Ohm-MilliammeterVGA Video Graphics ArrayVOR Visions Of RealityVGC Video Graphics ControllerVOS Verbal/Virtual/Voice Operating SystemVHDL VHSIC Hardware Description Language VP Virtual PathVHF Very-High FrequencyVPD Virtual Printer Device + VitalVHS Very High Speed + Video Home System + Product Data [IBM]Virtual Host StorageVPDN Virtual Private Data NetworkVHSIC Very High Speed Integrated Circuit VPDS Virtual Private Data Service [MCI]VI Visual Interactive (editor) [UNIX] VPE Video Port Extensions [Microsoft] +VIA Virtual Interface ArchitectureVisual Programming Environment[Intel]VPL Virtual Programming LanguageVIE Virtual Information Environment VPLS Virtual Private LAN ServiceVIF Virtual Interface + Virtual Interrupt VPM Video Port ManagerFlagVPN Virtual Page Number + Virtual PrivateVIM Vendor Independent Mail +NetworkVendor Independent Messaging + Video VPS Voice Processing SystemInterface ModuleVPSC Vault, Process, Structure,VIN Vehicle Identification NumberConfigurationVINES Virtual Networking System [Banyan] VPT Virtual Print TechnologyVIO Video Input/Output + Virtual[Dataproducts]Input/OutputVR Virtual Reality + VoltageViP Visual Programming [Lotus]Regulated/RegulatorVIP Variable Information Processing + VRAM Video Random Access MemoryVideo Information Provider +VRD Virtual Retinal Display + VirtualVirtual Interrupt Pending +Reference Desk

VRE Voltage Regulated ExtendedWAITS Wide Area Information Transfer SystemVRM Vendor Relationship Management + WAN Wide Area NetworkVoltage Regulator ModuleWAP Wireless Application ProtocolVRML Virtual Reality Modeling Language(originally named Virtual RealityWARWARPWeb ArchiveWeb Service Aggregtion, Rely andMarkup Language)PropogationVROOMM Virtual Real-time Object OrientedMemory Manager [Borland]WATS.WAVWide Area Telecommunications ServiceWaveform Audio (file name extension)VRRP Virtual Router Redundancy Protocol WBEM Web-Based Enterprise Management.VRS WordPerfect Graphics Driver (file W/C Watts Per Channelname extension)WC Word CountVRT Voltage Regulation Technology [Intel] W-CDMA Wideband CDMAVRU Voice Response UnitWCG Wide Color GamutVS Virtual StorageWCS World Coordinate SystemVSAM Video Surveillance and Monitoring +Virtual Storage Access MethodWD-40WDDMWater Displacement-40th AttemptWindows Display Driver ModelVSAT Very Small Aperture Terminal[Microsoft]VSE Virtual Storage ExtendedWDDX Web Distributed Data ExchangeVSF Vertical Scanning FrequencyWDL Windows Driver Library [Microsoft]VSI Virtual Socket/Switch Interface WDM Wavelength Division Multiplexing +VSIO Virtual Serial Input OutputWindows Driver Model [Microsoft]VSM Virtual Shared Memory + Virtual WDRAM Windows Dynamic Random Access MemoryStorage Management +Visual System Management [IBM]WEA.WEBWeb Enabled ApplicationEntities Emphasizing the WWW (DomainVSN Volume Serial NumberName) [Internet]VSOS Virtual Storage Operating System WEBDAV Web Based Distributed Authoring andVSS Visual SourceSafe [Microsoft]VersioningVST Virtual Studio TechnologyWEBNFS Web Network File System [Sun]VSTO Visual Studio Tools [Microsoft] WEFT Web Embedding Fonts Tool [Microsoft]VSWR Voltage Standing Wave RatioWELL Whole Earth 'Lectronic Link (BBS)VSYNC Vertical SyncWEP Wired Equivalent Privacy +VT Vertical Tab +Virtualization Technology [Intel] WFMWireless Encription ProtocolWired For Management [Intel]WFQ Weighted Fair Queuing [Cisco]VTAM Virtual Telecommunications Access WFW Windows For Workgroups [Microsoft]Method [IBM]WGS Work Group SystemVTNS Virtual Telecommunications Network WHAM Waveform Hold and Modify [Microsoft]ServiceVTS Volume Tracking DriverWHCWHQLWorkstation Host ConnectionWindows Hardware Quality LabsVUI Video User Interface[Microsoft]VUP VAX Unit of PerformanceWIDEN Wideband Integrated DigitalVWB Visual WorkBench [Microsoft]Enhancement NetworkVWM Virtual Window ManagerWIFI (Wi-Fi) Wireless FidelityVXA Variable-Speed Architecture [Ecrix] WIKI Wikipedia (encylopedia)VxD Virtual Extended Driver [Microsoft] WIM Wireless Instant Messaging.VXD Virtual Device (file name extension) WIMP Windows, Icons, Menus and Pulldowns[Microsoft]WIN 9.X Windows95/Windows98VXML Voice Extensible Markup Language WIN...CE Windows Compact Edition [Microsoft]V&V Verification and ValidationWINDBG Windows Debugger [Microsoft]WINE Windows EmulatorWINForum Wireless Information Networks ForumWIN...FS Windows Future Storage [Microsoft]W...| TOP | UP to V | DN to X | BOTTOM |W/ WithW3 (see WWW)W3A World Wide Web AppletsW3C World Wide Web ConsortiumW4 What-Works-With-WhatWAAS Wide Area Augmentation SystemWABI Windows Application Binary Interface[SunSoft]WAE Wireless Application EnvironmentWAI Web Accessibility Initiative +Web Application Interface [Netscape]WAIS Wide Area Information ServerWAITI Wait-For-InterruptWIN/MAC Windows MacintoshWIN...MCE Windows Media Center Edition[Microsoft]WIN...ME Windows Millennium Edition[Microsoft]WINS Windows Internet Naming Service[Microsoft]WIN...SE Windows Second Edition [Microsoft]WINSOCK Windows Open Systems Architecture[Microsoft] +Windows SocketsWINWORD Word For Windows [Microsoft]WIN...XP Windows The "Experience" [Microsoft]WISE WordPerfect Information SystemEnvironmentWISP Wireless Internet Service ProviderWIT Web Interactive Talk [Internet]

.WKB Workbook (file name extension) Interface [O'Reilly][WordPerfect]WSDL Web Services Definition/Description.WKE Worksheet (file name extension) Language [IBM/Microsoft][Lotus 1-2-3] [LDC]WSE Web Services Enhancement.WKQ Spreadsheet (file name extension) WSH Windows Scripting Host [Microsoft][BORQU]WSP Wireless Session Protocol.WKS Worksheet (file name extension) WSUI Web Services User Interface[Lotus 1-2-3] [LDC]WT Write Through.WKZ Compressed Spreadsheet (file name WTA Wireless Telephony Applicationextension) [BORQU]WTLS Wireless Transport Layer Security.WK1 Worksheet (file name extension) WTM Wired For Management[Lotus 1-2-3] [LDC]WWIS World Wide Information SystemWL Word Line[Internet]WLAN Wireless Local Area NetworkWWW World-Wide Web [Internet].WLG Dr. Watson Log (file name extension) WXGA Wide Extended Graphics ArrayWLL Wireless Local LoopWYSBYGI What You See Before You Get It.WMA Windows Media Audio (file name WYSIWYG What You See Is What You Getextension) [Microsoft]WMC Workflow Management CoalitionWME Wireless Multimedia Enhancements.WMF Windows Metafile Format (file nameextension) [Microsoft]X...WMFSDK Windows Media Format SoftwareDevelopment Kit [Microsoft]WMI Windows Management Instrumentation| TOP | UP to W | DN to Y | BOTTOM |[Microsoft]XA Extended Architecture + ExtendedWML Wireless Markup LanguageAttributeWMP Windows Media Player [Microsoft] XACML Extensible Access Control MarkupWMRM Write Many, Read ManyLanguageWMT Windows Media TechnologiesXACT Cross-Platform Audio Content Tool[Microsoft]XAPIA X.400 Application Program Interface.WMV Windows Video File (file nameAssociationextension) [Microsoft]X2B Hexadecimal to Binary [REXX]WNIC Wide-Area Network Interface Co- .XBM X-Windows Bitmaps (file nameProcessorextension) (black and white)WNIM Wide-Area Network Interface Module XBRL Extensible Business ReportingW/O WithoutLanguageWORM Write Once, Read ManyX2C Hexadecimal to Character [REXX]WOS Workstation Operating SystemXCHG ExchangeWOSA Windows Open Services/SystemsXCMD External CommandArchitecture [Microsoft]XCOPY Extended CopyWOW Window On Windows [Microsoft]X2D Hexadecimal to Decimal [REXX]WP WordPerfect + Word Processing + Write XDF Extended Density Format [IBM]ProtectedXDR Extended/External Data RepresentationWPA Wi-Fi/Wireless Protected Access XFCN External Function.WPD Windows Printer Description (file XFDL Extensible forms Description Languagename extension)XGA Extended Graphics Array [IBM].WPG WordPerfect Graphics (file name XHMD X-Directed Horizontal Magnetic Dipoleextension)XHTML Extensible HyperText Markup LanguageWPHD Write-Protect Hard DiskXID Exchange Identifier.WPK Keyboard (file name extension) XIOS Extended Input/Output System[WordPerfect].XLA Add-In (file name extension)WPM Words Per Minute[Microsoft-Excel].WPM Macro (file name extension)XLAT Translate[WordPerfect]XLF Exceptional Fortran [IBM]WPOS Workplace Operating SystemXLIFF XML Localization Interchange FileWPS Windows Printing System [Microsoft] + Format [IBM]Workplace Shell [OS2].XLK Backup (file name extension)WPVM Windows Parallel Virtual Machine [Microsoft-Excel].WQ1 Spreadsheet (file name extension) XLL Extensible Link Language[BORPQU]XLM Excel Macro Language [Microsoft].WQ! Compressed Spreadsheet (file name .XLT Template (file name extension)extension) [BORPQU][Microsoft-Excel]WRAM Windows Random Access MemoryXMIT TransmitWRE Weighted Random Early Detection XML Extensible Markup Language[Cisco]XMM Extended Memory Manager [LIM/AST].WRI Write (file name extension)XMS Extended Memory SpecificationWRK Windows Resource Kit [Microsoft] [LIM/AST]WS WordStar + WorkstationXNS Xerox Network System (protocol)WSAPI Web Site Application Program[Xerox]

XOFF Transmitter OffXON Transmitter OnXOR Exclusive OR (Also EOR)XP Extreme Performance [Compaq]XPATH XML Path LanguageXPCOM Cross Platform Component Object Model[Mozilla]XPE XP Embedded (see WIN...XP)[Microsoft].XPM X-Windows Pixelmaps (file nameextension) (color)XPRM Xerox Print Resources Manager [Xerox]XPS XML Paper Specification (file format)XRI Extensible Resource IdentifierXRNS Extensible Resource Name SystemXRT Extensions for Real-TimeXSL Extensible Stylesheet LanguageXSLT Extensible Stylesheet LanguageTransformationXSMD Extended Storage Module Drive(interface)XSSI Extended Server Side IncludesXTAL CrystalXTCLK External Transmit ClockXUL Extensible User-Interface Language[Netscape]Y...| TOP | UP to X | DN to Z | BOTTOM |YAM Yet Another Modem [Omen Technology]YAHOO Yet Another Hierarchically OfficiousOracle [Internet]Y2K Year 2000(Y/N)? (Asks for a YES or NO decision)YTD Year To DateA Glossary of ComputerOriented Abbreviations andAcronymshttp://www.geocities.com/ikind_babel/babel/babel.html