[Samba] how a domain user can become a local administrator ?

[Valéry Roché]

Hi list,

I'm using Samba wit a LDAP server. Everything works fine, but I'd like 
to know how I can declare a user or a group user as an administrator of 
the workstation he/she is logged in.
I tried to modify the guid and the SambaSID in the ldap server, but it 
doesn't work. Is there another solution than to declare locally on the 
workstation that such group must be of the local administrators group ?

Thanx in advance,
Valéry Roché