[plug] UPS's

[Colin Muller]

I'd really appreciate it if someone could tell me (or a pointer to one)
what happens at point 5 below in a well-designed setup (and how it
happens):

1. Power fails, UPS continues providing power
2. Power not being restored, UPS lets computer know via serial line and
PM software that power is getting low.
3. Computer shuts down (or as Matt suggested, goes into single-user
mode)
4. Power is restored.
5. ???

Obviously, the ideal would be that in 5, the computer powers up again
(or returns to networked multi-user mode). How is this achieved?

Colin