Is this possible? if so.. how?

Hi,

I currently am involved in setting up a training lab.
What i’d like to do is to replace the room full of PCs running windoze with a room full of PCs running linux. (possibly even linux terminal server).

Does anyone know of a package that will allow a ‘central’ terminal to take control of all the machines in a room, so that i can demonstrate an activity. At the moment, people are trying to persuade me that sticking with Windows and RM’s schools package is the best option.
I know that(for me) linux is the better option.. cheaper too!

Thanks in advance.

Chris