ORA-27101 after changing Win2k workgroup name

Hi,

I changed the Windows 2000 workgroup name on an Oracle server hosting two databases. After rebooting, it looked like the services started but when I tried to connect with sqlplus and svrmgrl, I got

ORA-01034: Oracle not available
ORA-27101: Shared memory realm does not exist

Strangely, there were no entries in the Alert logs for this startup.

So I changed the workgroup back to the old one and rebooted the system, it's running OK again.

Does anyone know in what way Oracle depends on Win2k workgroup name?

Thanks,