I did something like this on a Radeon 9000Pro, but I don't know if this is what you're looking for.
You see, the movie is drawn on the overlay. You can play with the card settings to display the movie in full screen on the TV, even if it's not full screen on the computer. The bad part is that this only works while the player window is not minimized (it is not necessary to be in foreground, it can be in background, with something on top of it, but not minimized in the taskbar). This way, I managed to watch movies while my girlfriend was making some documents, or playing cards or whatever.
The bad part is that when you enter a serious and real game (unlike the solitaire type), it will go to full screen and be displayed also on the TV. I didn't manage to solve this, maybe someone can give some ideas....
Edit: Bogdandudu, from the name, I'd say that you're from Romania, right?
"I cannot give you a brain, but I can give you a diploma"
- The Wizard of Oz, talking to the Scarecrow<P ID="edit"><FONT SIZE=-1><EM>Edited by cryo on 03/19/04 09:45 AM.</EM></FONT></P>