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Hester - 9:11 am on Apr 17, 2008 (gmt 0)
AFAIK not to draw the entire OS - every window, every element. You couldn't have spinning windows with live video in them in XP. Or scalable applications where the entire contents of the window rescale in milliseconds. Correct me if I'm wrong.
Windows has used the hardware acceleration features of graphics cards since the early 90s.