i know this dosnt help... but check this out...
skip to 48 seconds if you dont want to watch the dude talk. Hes a gamer that rocks a 3 monitor setup.
this thread reminds of his intro and how much I want it
I love my dual monitor setup but theres always better
but with my own experience, I have settings that assign monitors to games and such. Im just using the built in software with the video card. Its all in the settings and in games like WoW you can make profiles like said previously that allow you to assign monitors just for that game. So I assume a few games have those options.