How do I terminate a domain?

Hello.  We have two domains operating on the network.  One is the new, current domain (lets call it and the other is the old one (lets say  I am moving the PCs in the office over to the new domain, and will evenutally have no-one using it.  My question it two-fold.  First is how to i stop the domain and have the server it's join the current domain. Second is what would happen to any PCs that are still joined to the domain once it's stopped? I am aware of the DCPROMO and DCDEMOTE commands (that they exist.. rather than what to do with them!). I know that the server (win 2003) is the DC for the domain, and has all the "roles" and the the DC for the domain does too for its domain.
All servers are running Win 2003, and all PCs are Win XP Pro SP2. Not sure what else you;d need to know to help.  
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To decomission, run 'dcpromo' on each domain controller within the domain.  On the -last- DC that you run dcpromo on, select the check-mark next to "this is the last domain controller in this domain" when running dcpromo.

If there are any workstations left in the domain after the final DC has been decommissioned, these workstations will only be accessible using a local administrator account until you drop them into a workgroup and then join them to the domain.
As stated above, just run DCpromo and follow the steps - it is strait forward.  When you tell the wizard that it is the last DC in the domain, it takes care of everything.  Once it is demoted, then you can just join the new domain and it is now a member server, or make it another DC by running DCpromo again after it is on the new domain.  If the users are local admins on the workstations, then they could be droped directly from that log in into a workgroup and back into the new domain (you can go strait from one domain to the other, but I like going to the workgroup first)
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