samba - Jun 2005 - clearing password from cache after changing password via swa/smbpasswd

Once users have changed their Samba passwords using swat or smbpasswd, how can 
they force windows to drop the old password, so they can reauthenticate with the
new one.  The always-works-fix is, of course, to reboot, but didn't know if 
there was a way to force this.

I've done some searching on this, but most words used to describe this issue
point to dead ends.  If there is an existing FAQ a link would be much
appreciated,


Thanks in advance
jd

oh, using samba 3.010 on Freebsd 5.4, all XP clients.