samba - Feb 1998 - Lookup username or machine name with ip-address?!

Hi

When I want to send a winpopup message to a win95 client, I don't always
know the name of the machine (in wind95 setup) or the name of the user
that is logged on... Is there any way of sending a message when you don't
know that? I can ofcourse send a message with -I and -M the DNS-name of
the machine, but that's not accepted...

Paul