I have a friend who is not too computer savvy to whom I sent a simple XLS
that contains a VBA macro I wrote to do some simple sorting of one of the
sheets. When he runs it on his machine he gets what he claims is a "run
time error 6" message. It's not clear to me sitting 5,000 miles away
whether this is an Excel error or a VBA error message.

What's frustrating to me is that I've typed every variation of the error
message I can think of into both the Excel and VBA help systems and they
don't come back with any explanation of what it means. Can anyone here
point me to a source of explanations for messages of the "error 6" variety?

FWIW, my system is Office 2003, while his is Office 2003 Professional. My
understanding, perhaps misguided, is that those two systems have identical
Excel packages though. The difference lies only in the inclusion of
database software. Both systems are running under XP-Home.

Thanks.

Bill