Mapping Command key on Mac OS X

This should be an easy question, but I didn't see it in the archives
nor in a general google search. I'm running AdvanceMAME on Mac OS X
10.3, and I want to map the right Command key ("Apple key") to one of
the input buttons. But I don't see anything that might represent the
command key (I tried 'rwin', but no luck), and advk doesn't work-- it
says there was no keyboard driver compiled in or somesuch. Can someone
tell me either how to map the Command keys, or how to get advk
working?

Thanks in advance,
Michael

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