Quote Originally Posted by tux
i think there *is* a limit to how many 3d windows you can have open in xp. but that limit is beeing raised to a silly number for vista
AFAIK there is no limit on number active apps, using Direct3D, in XP. Of course you can have only ONE app requiring exclusive mode at a time.

Windows Vista of the other side has new driver model and part of this model is: specification for new (fully WGF2.0 compatible HW) to allow preemptive multitasking build in HW. This way multiple apps using D3D (including Windows build-in 3D desktop manager) will not constantly fight for HW 3D engine how this happens in WinXP.