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    From: David A. Moon <Moon@STONY-BROOK.SCRC.Symbolics.COM>

    It can be
    fairly difficult to construct module names that will work as expected as
    file names on all the different file systems in the world.  There are
    length restrictions, character set restrictions, and upper case versus
    lower case issues. 

I've run into these myself, particularly the uppercase/lowercase
problem, which is more of an issue with symbols since print names are
generally uppercase and people like to use lowercase file names on
systems that care about such things.  But this is a problem with
PATHNAME and PARSE-NAMESTRING, not modules specifically.  We here at
Utah had terrible problems trying to figure out how to do PCLS on the
Cray under CTSS, where you can only have 6 character filenames, no
filetypes, and no directories!