What FuzzyD said. Or, click View > Header and Footer. Put a checkmark on
footer and type your text in it. Click Apply to All.
Now, click View > Master > Slide Master.
Click Slide Show > Custom Animation.
Add the desired effect onto the <footer> placeholder.
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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: Sept 05, 2007
(Amazing PowerPoint animations, artworks, games here) http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate