Heather,
Changes can be tracked in PowerPoint XP when you send the file to someone
else for review. You do that by File| Send To| Mail recipient (for review).
From the help file:
The following changes are tracked by Microsoft PowerPoint 2002 when you send
a presentation for review:
Presentation-level changes
Slide size
Content and list of named shows
Headers and footers for slides, Title slides, and notes
Slide-level changes
Color scheme
Animation settings
List of shapes
Slide master IDs and locked templates
Slide master list of color schemes, default text styles, background, and
objects
Slide transition
Slide layout
Headers and footers
Shape-level changes
Action settings
Recolor information
External objects
Paragraph-level changes
Bullet typeface, color, and size
Bullet animation schemes
Bullet margins and tabs
Paragraph indent, alignment, and direction
Paragraph margins and tabs
East Asian word wrap and alignment settings
Text-level changes
Font typeface, color, and size
Languages
Hyperlinks
--
Regards,
Glen Millar
Microsoft PPT MVP
http://www.powerpointworkbench.com/
Please tell us your ppt version, and get back to us here