Re: AT&T troff requests

[Humm]

Quoth G. Branden Robinson:
> > As far as I can tell, none of them are mentioned in the Troff User’s
> > Manual (CSTR 54, Plan 9, and Heirloom versions), in Mandoc docs, or in
> > Groff docs.  I suggest mentioning these somewhere in the docs, even if
> > not implemented.
>
> That's a bit beyond the scope of the groff documents we have.  I've
> added substantial historical and comparative material, but that's
> generally in the context of addressing compatibility issues and
> motivating why features are present or work the way they do.
>
> About flat-out unimplemented requests (or escape sequences), I can't
> find much to say.

I understand.  I wonder where such documentation might be appropriate 
today—I wish for future me to have an easier time finding information.

--
Humm