For slide shows where hyperlinks have been used to jump from slide to
slide, I'd like to provide a "back" button that works like the "back"
button in a browser. I.e., it remembers on a stack the slides that
were viewed and pops its way back in the reverse order. A hyperlink
to the "last slide viewed" only goes back one level, and then toggles
between the pair of most recently viewed slides.

Does anyone have a way to implement this? I want it bad enough to
program a Pp add-in if necessary. Any thoughts about how to do that?
Thanks.