I concieve of some environment like
\begin{external}
Here is some text in the main.tex document.
I want this text to appear as a link off the main document.
\end{external}
This can be done through images (I believe) with
\htmlimage{external}
This can also be done with sections.
Unfortunately, all sections appear to become hyperlinked or else none become
hyperlinked.
For an amount of material equivalent to a section, I wish to type this
material in the main.tex document, not have it appear in the main document,
but have a link from the main document to this.
How can I do this in latex2html?