$WW,1$$FG,2$#help_index "Topic/SubTopic;OtherTopic"$FG$
The help index preprocessor compiler directive sets the topics for syms subsequently defined.  You specify subtopics with a '$FG,2$/$FG$' tree hierarchy and multiple topics separated by a '$FG,2$;$FG$'.  The index ctrls $FG,4$HI:topic$FG$ links.

$FG,2$public$FG$ can be placed before symbol to make it show.

$FG,2$#help_file "filename[.TXT.Z]"$FG$
The help file preprocessor directive places a file as the heading text in a $FG,4$HI:topic$FG$ link for the current help index.