The talk is a set of pages organized on two levels,
indicated by the indentation in this contents.
At the second level, the backward arrow
takes you back to the first level
and the forward arrow
takes you to the next node at the first level.
There are two kinds of pages, diagrams and bullet lists.
For diagrams there is a commentary below the diagram
and sometimes an audio version of this.
Alan Bond
2002-07-21