Domain Creation

You can create a workgroup (in Win 9x or NT or 2K) real easily. When you install the O/S on a box, and you get around to installing the Networking components you will be prompted to join a workgroup or a domain. Select "workgroup", and type in a name. It does not matter if any other system on the network is configured to that workgroup. To join an existing workgroup, just type in the name of an existing workgroup. There is basically no validation when working with workgroups.

"Domains" is essentially an NT concept (and arguably Win 2K picks it up and refines it - I say "re-de-fines it"). You will need to have setup at least one Domain Controller (Primary Domain Controller = PDC) for that domain. Give it a name that is unique on your network if setting up a new domain. You'll also want to consider setting up trusts among domains if you have more than one domain on your network.