The help doesn't seem to have any help for the help system.
Well, actually, I was trying it out and had some problems.
Bookmarks won't let me create any new top level folders - I'm stuck with toolbarMenu and bookmarksMenu and I can't remove them.
Somehow I created a bunch of tabs at the top of the content pane but I don't know how.
What does the "open pages" window show?
What does the "synch with table of contents" button do (it doesn't seem to work)?