In PowerPoint 2002/XP and above,
You can add Emphasis (Spin) on the arrow.
Then set the Start to "After Previous" so that they will animate
automatically.
Hope that helps.

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Shawn Toh (tohlz)
Microsoft Most Valuable Professional (MVP PowerPoint)
Site Updated: Sep 01, 2006
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> Can I animate a drawing object (arrows) to rotate automatically in a
> powerpoint.