Menu drive PP presentations

[Sigurd]

I want to create a series of short PP presentations for visitors to our historic building. The idea is that the visitor will be created by a page on the monitor with a menu created in PP that has a list of presentations which can be selected by pressing the appropriate number on a numeric key pad. Pressing the number will start the presentation and then return to the menu.
While I can produce the individual presentations I have no idea how to create the menu and return to it after the presentation is finished.
I have tried Googling and searching without success probably because I can't think of a short way to describe what I want!