> I'm still surprised I can get a shaded textured 3D scene with shadows 
> calculated refreshed faster than my monitor sync rate, but PowerPoint 
> can't smoothly scroll text onto the screen without tearing it. :-?

Is that on XP? - I think that's because in the XP desktop you can't redraw 
in sync with the monitor.  This is fixed in Vista because (IIRC) everything 
is double-buffered before being shown on the screen, just like in a 
full-screen game that uses the 3D card.

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