I think i understand your question! While in slideshow mode having a visual refererence to your presentation content. if this is correct have a look at this. There is a powerpoint add-in that automatically creates a visual reference (Slides Thumbnail) for each slide you select should form part of the index. If you mouse over the thumbnails you get the slides title. You can click at any point on the thumbnail of your choise and go to that slide. In realtime you can even text search slides based on words in the titel too. Useful for presentations with a lot of slides.

http://www.youtube.com/watch?v=abXJ90Irmjs