How change workgroup membership unattended

[FUBARinSFO]

Hi:

How do I programmatically join a different workgroup than the default workgroup WORKGROUP? That is, replicate the GUI actions of System Properties | Computer Name | Workgroup Change (to rename this computer or join a domain) | Member of Workgroup | WORKGROUP --> <my workgroupname>. Winnt.sif handles this properly provided that there are no NIC problems, but seems to choke at joining the specified workgroup for NIC devices that are being added in the install process.

Failing a way to fix this properly with winnt.sif (it may be due to NIC driver problems), I want to patch it up at the end of the unattended install.

Thanks in advance for your help.

-- Roy Zider