Hi,
afaik, the functions pass arguments to the C DLL's which then 'take
over' Excel and return the data from the DLL. You cannot do it with out
the C code.

I'm no expert, and i would love to be wrong, but unless you are
prepared to do some COM automation & DLL writing then I don't think you
will be successful..

Perhaps this might shed some light...

http://www.cpearson.com/excel/differen.htm
OJ