Workgroup rename in Server2003

I manage the network at a very small bookstore. There is one server running Windows Server 2003 and it is offering files through SMB shares to ten Windows XP Home clients. User accounts are setup and permissions are enabled. The Windows XP Home clients log in using a batch script I wrote that requests a username/password from the user and then maps the shared folders to X:, Y:, and Z:. No clients are on the Domain and there are no SQL Servers. Active Directory is not configured.

The owner has asked me to rename the Workgroup to something else. I'm not very familiar with the more advanced workings of Server 2003 and I've tried to find information on renaming the Workgroup, but have only found information on renaming the Domain. I've looked through the documentation on changing the Domain name and saw no specific mention of "Workgroup", but when changing the Forest Description File, I see that the NetBIOS name for the Forest Root can be altered. I'm guessing that this would be the Workgroup name.

Is my assumption correct?

If so, I have a few more questions about the Domain Rename procedure:

Can the Domain rename procedure be executed locally on the Server 2003 machine?

What problems may I run into with Active Directory not configured?

Finally, I understand there is a potential risk in performing this procedure -- should I even attempt this? Changing the Workgroup name isn't absolutely critical in the owner's current situation. He was doing it as a convenience to the software techs that come in and manage his bookstore application.