Ok, I have found out how to make the above, but when I move my mouse from one of the windows to the other it lags for a sec. Any way to remove that lag? Or does it have to lag for that sec when you move the cursor around?

Hmm, again we did the same on his pc and it did something like the pictures above. I saved my maximizing and imported it on his and made the same things in the setup as on mine. He runs xp and I run vista, which could be the difference, but I don't really know, since I'm new to this. Any ideas how to make this work?