[CentOS] Adding samba clients to samba server

I have an application that requires the use of netbios names instead of IP 
addresses, and the company that produces the application says that's the 
way it is.

I have a Windows XP machines running the application, and I want to add it 
to a domain controller.   I have a Centos 5 machine onto which I've 
installed Samba and configured it to be a DC.   I now want to add a couple 
linux workstations, also running samba, to this domain controller as 
workstations.   I've done this millions of times under Windows, but never 
added a samba client to a samba server/dc.

How do I do so?

It is my hope that this will permit me to then use the application, as 
I'll have added the XP machine to the Samba DC, too, thus hoping netbios 
names work properly.

Thanks.

Scott