[Samba] When to use Winbind ??

[Gary MacKay]

Am I correct that you only need to run winbind if you have other servers 
are involved? If all I have is a samba server acting as the PDC and that 
is it, I do not need to run winbind, right?

    The samba by example book shows using chkconfig to start smb, dhcpd, 
etc., but does not mention winbind. Later on it shows doing a 'ps ax' 
and it shows winbind running. Just wanted to confirm.