samba - Nov 1998 - W95/98 connect to any SMB share as another user?

In vanilla Windows 95/98, is there a way, short of logging out and back in 
as another user, to map a network share as another user?  Example of what I 
want to do:

Start Windows 95/98, network login as username=Fred, password=FredsPassword

map H: as \\machine1\share1 as username=John, password=JohnsPassword
map M: as \\machine2\share2 as username=Jane, password=JanesPassword

Even logging out and back in will only allow one of these to be mounted at 
a time.  Some of these shares are on Samba, but some are not.

If it cannot be done with unmodified 95/98, is there a piece of software 
around (loading WNT doesn't count!) that will enable this behavior?

Thanks,

David Mathog
mathog@seqaxp.bio.caltech.edu
Manager, sequence analysis facility, biology division, Caltech