This is a longshot, but hey everything is possible these days.
Is it possible to create a software videomixer, to send the output of one computer into another (Through ethernet or something) and from that computer send both outputs combined to a projector?
Reason I ask, is that I want to be able to work on a composition with one of my friends simultanously while using a triplehead2go. It doesnt sound impossible, but what do I know?