samba - May 2004 - one samba server two workgroups, posible?

Hi, this is a questions that is ticking around my head some time:

I'd like to have one samba server listening on two different subnets:
subnet 1 workgroup 1
subnet 2 workgroup 2

Is it posible? Need I two instances of samba running on the same server?

Now for a few times I need to give service to workgroup 2 I restart with a
different smb.conf

Forgive me if this is stupid or I missed something on the docs, I swear I
didn't read them completely ;-D