Hi there
The Sync TOC button normally doesn't show unless you edit the
WebHelp generation options and disable automatic synchronization of
topics to the TOC. That's the default setting.
The Previous and Next buttons will only be active if you are
displaying a topic that is part of a browse sequence. If you are on
the first topic in the sequence, only the next button will be
active. If you are on the last topic in the sequence, only the
previous button will be active.
Hopefully this helped... Rick