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Possible? Yes. However, it would be tricky. With regular Windows programs, ie ones that use GDI for drawing, it's not that big of a deal. However, most modern games on the Windows platform use DirectX, and I don't believe that DirectX has any support for this sort of thing. You'd need to have a single logical surface that spanned multiple physical surfaces.
The only real way I could see for implementing this would be to have a fake DirectX layer between the program and actual DirectX. The program would draw to a single surface (and most video cards can create surfaces larger than the physical screen size, so you could still use hardware acceleration) of one of the video cards. Then it would blit portions to each of three other surfaces, which each correspond to one of the physical displays. I'd have no idea how to code such a beast, since I have next to no experience with DirectX.
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And once again, Probability proves itself willing to sneak into a back alley and service Drama as would a copper-piece harlot.
- Vaarsuvius, Order of the Stick
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