groff macros not appearing in AT&T troffThe groff -ms macros have a few minor extensions compared to the
AT&T troff -ms macros.
Indented display. The default behavior of AT&T
troff -mswas to indent; thegroffdefault prints displays flush left with the body text.
Indexing term (printed on standard error). You can write a script to capture and process an index generated in this manner.
The following additional number registers
appear in groff -ms:
Specifies a minimum space between columns (for multi-column output); this takes the place of the
GWregister that was documented but apparently not implemented in AT&Ttroff.
Several new string registers are available as well. You can change these to handle (for example) the local language. See ms Strings and Special Characters, for details.