> In the school, where i works, our teacher teachs how to work
> with Microsoft Word, using a 21" television connect to his
> computer...
>
> Is it possible to send the teacher's computer image for all
> computer connected in a TCP/IP network, using some software? (
> MASTER-SLAVE)

Try VNC, it is free and does exactly this:
http://www.uk.research.att.com/vnc/