Each slide should have six navigation buttons in Play mode:
- Back to Section Overview
- Next Section
Use the Section Header slide to "group" other sides and allow collapse and expand.
I found an old article "A Flexible Alternative to PowerPoint" on the net. It said the same thing:
One of the disadvantages cited by Tufte and others is that PowerPoint tends to confine the speaker to a single pre-set path, discouraging spontaneity and diminishing flexibility in response to the audience's interests.
Browsers can not only emulate much of PowerPoint, they can also do things that PowerPoint does not....A table-of-contents window can be on screen at all times, allowing you to jump spontaneously to different topics.