Specifies a jump to a labelled chapter, section, subsection subsubsection or figure.
The first argument is text to be highlighted (mouseable in help systems) and the second is the reference label. In linear documents, the section number is given following the text, unless the helprefnhelprefn command is used instead, where the section number is suppressed.
Note that when generating HTML, the label contents is automatically defined, and may be referenced using helpref.