[Samba] Removing account/passwd synchronization requirement

[Henry S]

I have a basic samba server up and running. My XP clients I can only 
connect to the samba share if have identical account names / passwds on 
both the XP client and the linux server. How can I eliminate this 
requirement so that an XP user can log into any valid account on the 
linux server and connect to the samba share ?

Thanks
Henry