PowerPoint - Determining the end of the slide show

[Bruce]

When running a PowerPoint presentation, how can I determine when the
user is on the last slide (and the last animation of that slide)?

I would like to be able to stop the user from progressing any further
if they are at the end.

When the SlideShowEnd event fires, it is too late. The
ActivePresentation is no longer valid.

Thanks...

--Bruce