First question, can Linux be configured to be the domain controller
on a network with Microsoft computers?
If so, where can I find information about configuring Linux for this
purpose?
Isn't Samba just a file and printer server?
I'm in the same boat, I have rh7.3 and trying to do the same thing.
F,Ruiz
File and print are a big part of what MS domain controllers do 
essentially, samba on a UNIX server, can replace a windows NT server, aswell as handle PDC for the "workgroup" on a windows network.