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something to consider:
if you have a dual headed nvidia it has its own built in xinerama extension that is awesome, however if you are using 2 cards, or a different brand you would need the standard (rather stupid) xinerama extension. weather using xinerama as an extension, or an nvidia builtin your wallpaper will pan the screens, however if you use 2 cards without xinerama or the nvidia dual headed as 2 option (if you don't know don't ask, to hard to give details) then each screen will have the same wallpaper but it will be duplicated not spanned.
I am using an ATI 9500 Pro with the standard Xinerama so the desktop spans both screens. It seems to operate well, granted my resolutions are the same on each. It does pop windows up randomy everywhere though, but a small price to pay in my opinion.
with standard xinerama on most card configs 3d excel has trouble, specially ful screen 3d, you might want to reasurch that. try glxgears at the promp, then also something full screen. ten also try both without xinerama.
For wallpaper images that are designed for dual display http://www.digitalblasphemy.com has a few good ones. A few are free, but his member section has a wider variety...and he will sometimes take requests to make images dual capable by changing his rendering settings and posting the resulting images. Enjoy!
exodist: I am not using the schneider drivers for my ATI card because they dont have Xinerama support. THus I dont have any opengl support because ATI is being lazy. I mainly use linux for work and programming stuff anyways, i have a windows gaming box for fun
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