[Groff] Understanding the ms macros

[Graham Ashton]

Is there a definitive set of docs for the ms macros? I've been trawling
round the web and read the groff_ms man page but haven't found anything
that seems definitive. 

I'm trying to find out what commands the ms package makes available, and
how to go about modifying things like page margins, etc. when using the
ms package.

Thanks.

-- 
Graham Ashton