I have applied the suggestions of Martin Sch"onert for adding online
documentation. They work. ON the other hand, there are a few drawbacks:
(1) One has to recompile the entire manual, which is time consuming.
(2) One has to use Latex, whereas I would prefer to use Plain TeX
(3) The formatting of the manual is itself unfamiliar. For example,
one has sections and chapters, but it is not clear how to create
subsections, subsubsections, etc. With more understanding of the
formatting, one could make one's own modifications to the code.
WIthout it, there are just chapters and sections.
(4) One really should not hack the manual.
It seems that there are various ways to solve these problems. One would
be to make additional options available to the online help command
such as to look in other places for TeX files, to accept Plain TeX,