[Samba] Bi directional trusts with server 2003

[Douglas Phillipson]

Is it possible to establish a two way trust relationship between a SAMBA 
Domain and Win2003 AD Domain such that Users in the SAMBA domain can log 
on to machines in the W2003 Domain and users in the Windows Domain can 
log on to XP machines  in the SAMBA Domain?    Is this a domain trust, a 
machine trust, both, or what?

Thanks

Doug P