Hmm, thats strange, cause I was experimenting with my Radeon 64 vivo. Using a vid camera attached to the vid in of the card, and messing with the ati video in software, gave me the exact results you are talking about. It would have a live cam, on my desktop. I would see all my normal icons, and could click on start, programs..etc, with no probs. It was kinda weird having a "live" background. I would ask why in the world would anyone want this though..
ZipMach