Hi,
You can add MetaData tags to a PowerPoint Presentation by clicking on File,
Properties. You also have the ability to create custom metadata
properties.
Within the presentation you can add Alt-Text tags to objects as well as
Screen Tips (mouse-over text) to links.
You can learn more at this link:
http://www.powerpointmagician.com/access/accessppthome.html
Although it's written for accessibility of presentations, it covers what's
available for tagging presentations pretty well.
HTH,
Glenna
