   WGL_NV_gpu_affinity
  I saw in the nVIDIA Forceware 91.31 release notes that there is a new extension named: WGL_NV_gpu_affinityIt probably does the same as the Windows function SetProcessAffinityMask but for the GPU on SLI machines.I didn't find any documentation on parameters for that function. Does someone have some ?   
  I'm betting on that being used for things like HavokFX, where one GPU is used for physics and the other for graphics...   ;  NVIDIA had suggested a while back that they would be opening up more direct control of SLI under OpenGL. My guess is that this allows just that.   