I&#x27;d be interested to know how you know that.  Did you just experiment?  Others have said that &quot;space&quot; will take one through the slides in sequence.  Is that genuinely discoverable?  How does one know when hitting space that one has seen <i>all</i> the slides, and not just taken a single path through a subset.<p>These are genuine questions - I&#x27;m heavily into usability (in a different context) and I&#x27;d be interested to know what people try, and what they conclude.  In my context people are uneasy about hitting keys and random just to see what happens.  On some web sites I&#x27;m afraid to move the mouse, because the mouse-over event has been trapped, and things happen that I don&#x27;t want, and can&#x27;t undo.<p>So how did you discover that ESC will produce an overview?