"Thomas Smith" wrote:

Excel 2003 has these perky little green triangles that will expand to
show detailed error messages for built-in functions. Is there a way
that I can communicate an error other than #VALUE or #N/A from
my custom C++ add-in function? If there is an answer from VB that would
be ok too.

You can return other error XLOPERs like #NUM or #NULL but there seems to be
no way to return an error message. For ManagedXLL, I have been using a
separate window to log such messages.

Jens.

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