If you have 2 monitors set up on your graphics card can you play co-op with each player on their own screen instead of split screen?
What game are you talking about? I can't think of anything recent that even supports split screen. I think L4D was the last I heard of (Even that was not 'officially' supported) Me guesses the simples answer will be 'it depends'. I'd start along the lines of (for example) if you ran 2 1024*768 screens and you could get the game to 'span' across a single 2048*768 resolution, than a 50/50 vertical split would put one player on each screen. Try looking into the techniques and hacks that people use to get games to work across multiple screens: http://www.widescreengamingforum.com/forum/viewforum.php?f=70
Well first you'd have to find a game which even supports multiplayer on a single machine which is tricky as hell. As Guinevere says, the last game which had any kind of support for such a thing was the first L4D and that's not exactly simple to set up. Basically, the answer to your question is no in the overwhelming majority of cases.
I was not talking about any games in particular tbh. I never knew not many games had split screen any more but that would be because I hate split screen on monitors and never check to see if a game does it. The last game I probably played split screen was either L4D2 on XBox 360 or Haze on PS3 OR Resident Evil 5. I just think having your own screen would be great for co-op
Yes, if the game supports it, you will have to resize the window to cover both monitors using either command line options* or programs like ShiftWindow. The game is not going to use both GPU's so there is going to be a slow down on top of the increased resolution, but this isn't going to be significant. *'-windowed -noborder -novid -w 3840 -h 1080' will cause l4d to cover two HD monitors side by side for instance.