search for: topic20

...]{foo} to link to the package pkg, to files foo.html and bar.html respectively. These are rarely needed, perhaps to refer to not-yet-installed packages (but there the HTML help system will resolve the link at run time) or in the normally undesirable event that more than one package offers help on a topic20 (in which case the present package has precedence so this is only needed to refer to other packages). They are only in used in HTML help (and ignored for hyperlinks in LaTeX conversions of help pages), and link to the file rather than the topic (since there is no way to know which topics are in whi...