> .\" NS Dd user macro (not parsed, not callable)
I no longer know, sorry. It marks documentation lines, that's for
sure.
> My first guess was it had something to do with comment-stripping for
> distributed tmac files, but that wouldn't explain why unprefixed
> comments are stripped too.
Well, `doc.tmac' doesn't appear to be stripped at all. And the `doc-'
prefix isn't removed either. Hmm... I seem to remember that we have
decided to drop that completely due to the increased speed of
computers.
> The description of the .HTML-NS macro (in tmac/www.tmac.in) would
> suggest something debugging-related:
This is unrelated.
Werner