It is if you enable TCP CORBA connections between the two machines,
or somewhat more dangerously if you use GCONF_LOCAL_LOCKS=1
What makes this one so much more dangerous?
Given that preliminary setup, the last bugs in multiple logins
have been fixed in RHL 9.
But as Seth says the "real fix" is well-known and it's just a matter
of someone having time to implement it. It is certainly known that
opening TCP between machines isn't a great solution.
And as you and I have talked about before. In some cases it is
impossible. b/c the two machines might not be able to see each other.