Just an update.
I can NLTEST /DCNAME

OMAIN and it prints the correct
server name.
I tried downloading and running a version of netdom that
Michael Giorgio pointed to in one of the threads here.
I got an error to the effect that this action requires
directory services. I tried again and got access denied if
I recall correctly. The XP box I ran it on did in fact
appear to be joined to the domain despite the error. But
when I tried to add a domain user to the local machine I
got a trust error. I tried nltest /SC_QUERY

OMAIN and got
an RPC error..
No luck so far..
So
at
side.