Taking control of an interactive job

Hello,

I would like to take control of an interactive job by myself.

I mean :
1) With STRCPYSCN you can see what is on a remote screen, i know how to
do the same thing without using this command. What i want is not only to
see what the user does but also
        1st) he can't use his keyboard.
        2nd) what I press on my keyboard is sent to his screen like he          
did
it.
2) I don't want to use a tool or a software like Tango04 or else.
3) I want to write a pgm (using API's maybe or OS commands) to do it.

Thanks in advance.

Eric Bruhier

p.s : i'm sure my english is very bad (sorry).
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