[Samba] PDC + Win XP client + Policy file

[Ninja]

Hi to all. I'm tring to make a linux server to act as a PDC using samba 3,
using on the client Win XP. I have setted it and everythings is ok, but I
have no idea of how to create policy file, so to restrict access on the
client at the different user...

It's possible to use poledit on Win XP?
What can I use and how I have to write the smb.conf to realize it?

Thanks to all.