Automatic callout text navigation adds a Next and Back arrow at the bottom of your talk bubble. This option allows the viewer to control the pace of your presentation. The Back arrow button takes the viewer to the previous talk bubble. The Next arrow button skips the remaining talk bubble delay and continues the presentation. The fast rewind << and fast forward >> buttons in the Flash playback controls will find the previous / next talk bubble in your presentation. 

The navigation between callout text is automatically controlled by Instant Demo. If you add or delete a callout, Instant Demo will automatically update the navigation links. The benefit of this feature is the presentation can be viewed at a pace that suits the viewer. It will never be too fast or too slow, ensuring the presentation is  useful and compelling for the audience.