A programm that works in backgroud, has to open a screensaver, if I press a key

[Brainhacker12]

At our big eaveningshow there's one sequence where a matrixscreensaver has to apear. The screen is beamed onto a big wall, so there can't be something of windows, like the little thing, that aperas then you press alt+tab, and there can't be a mousepointer.
The easyest way for me, the manager of the computer and the beamer, is to code something that makes the screensaver apear if I press a key and makes it disapear when I press an other key.

I don't have an idea how to begin programming that thing.

Does someone have an idea how to do a programm like that?
(I don't want to programm a screensaver, just a programm to starts and ends the screensaver)


www.ironmodders.ch.vu

.