Hi lummas and welcome to our community
This is a feature unique to compiled .CHM files created using
RoboHelp. The feature is known as "Browse Sequences". Essentially,
you click the Tools menu then Browse Sequence Editor. From there
you create one or more browse sequences.
Special things to note.
1. Browse Sequences are presented this way in the Microsoft
Compiled HTML Help (.CHM) format only. They can be used in the
WebHelp/FlashHelp formats, but will appear differently in those
formats.
2. In order for browse sequences to work when the .CHM file
is given to others, you need to distribute an additional file named
HHActiveX.dll. Your end user also has to register the file in order
to make Windows aware of it.
All of this should be outlined nicely in the RoboHelp HTML
Help file. Just crack it open and scan the Index using the term:
Browse Sequences.
Cheers... Rick