How Samba make the Domain Group

[Yaya]

Hi all,
Installing Samba as a PDC on RH Linux.
Using usermgr on win9x/NT, I find the Groups those aren't the Local Unix
Groups.
One of them is 'Administrators' I think, I am not sure, not running my samba
2.2.2 server right know.

I wonder how Samba [2.2.2 and before I think] make the Domain Groups?
So far I am using TNG that has no Domain Groups, but Unix/Linux Groups.
I must make the *.map file to make them.

thx
Yaya