The SSC item http://fmwww.bc.edu/repec/bocode/s/SSCsubmit.html
has been revised to discuss two issues relevant to those submitting
materials to the SSC archive. It has become evident that a number of
English words not in use as official Stata commands are nevertheless
reserved in Stata 8 by the graphics subsystem. Use of one of those
words as a user-written Stata command is problematic, as I have
discovered with respect to -margin-. I have communicated this concern
to the author of -margin-. Please see the web page above for a list of
additional words that should not be used for user-written command
names.