Keith,
You could do this, go to Insert Hyperlink, click the Screen Tip button. Now
only enter
one space. The only thing that will show is a small yellow box under the
hyperlink.
As Luc says. Also there's a little prog alphaXP that can set tooltips to 100%
transparent. It's not free but if I remember correctly it was very cheap. http://www.zeroherosoftware.com/alphaxp.html
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Amazing PPT Hints, Tips and Tutorials