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vertical retrace

Hi,
Is it possible to sync to the vertical retrace in Carbon? OSX? I am
getting a lot of shimmering on the screen as I update, and I have heard that
the VBL interrupt is used to eliminate that in games. Technote TN2003:
moving your code to Carbon says that the Time Manager should be used. Is
there a document that describes how to use the Time Manager to avoid
screen-tearing, to ie simulate the VBL? What do most videogames do now for
this?
Thanks!
Bob
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