Shutdown and Reboot override

[rusty at brownzilla.com (Rusty Shackleford)]

Is there a way to override a reboot if another user issues it?  I have been
working on a machine where multiple people are logged in as root or have the
ability to and most of them act as if they are the only ones on the system
and reboot and shutdown the machine.  If not override could I push out the
time until it goes down?  I have been searching around for it and the few
places that I saw that mention it say no but I thought I would throw it out
there.

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