Restricting root access from console

[Steve Scarfone]

Is there a method of restricting root access from the console on a
Decstation 2100?  Specifically I'm concerned with a user powering down
a worstation and ^Cing the multi-user boot and having root access.

Removing 'secure' from the console line in /etc/ttys doesn't seem to
solve this particular problem.

If it makes a difference, the 2100's are running Ultrix V3.1D (Rev.
54).

Thanks for any help!
-- 
Steve Scarfone          "You keep saying that word. 
scarfone at cs.buffalo.edu        I don't think it means what you think it means."
scarfone at sunybcs  uunet!cs.buffalo.edu!scarfone       -The Princess Bride