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start<br />

NO<br />

is module<br />

on HD<br />

start new<br />

module<br />

YES<br />

enter ID &<br />

PWD<br />

beg<strong>in</strong> lesson<br />

end lesson<br />

exit<br />

work with<br />

current<br />

modules<br />

YES<br />

NO<br />

NO<br />

Student/Client Server<br />

store<br />

current<br />

module<br />

send ID &<br />

PWD<br />

store restart<br />

data<br />

request<br />

current<br />

module<br />

check for<br />

module<br />

version<br />

store new<br />

module<br />

send<br />

restart data<br />

YES<br />

go to next<br />

module<br />

NO<br />

valid ID & PWD<br />

YES<br />

current<br />

user<br />

license<br />

FTP restart<br />

data<br />

new module<br />

version exists<br />

NO<br />

FTP<br />

current<br />

module<br />

FTP new<br />

module<br />

store resart<br />

data<br />

Figure 1: Student/Client/Server Communication<br />

YES<br />

YES<br />

NO

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