before googling, you should read up on the
documentation provided
by the Samba project ( samba.org ).
It is possible to set up an network where Samba is the PDC but at present this
would require your BDCs also to be running Samba. The reason is the domain database
is maintained by a backend LDAP server, which is not what Windows does.
If you install Cygwin on your Win2k system, you can then install Samba on it, too.
A future version of Samba is expected to provide full Active Directory services.