[VIM] HP lingo or one hell of a hack?

[security curmudgeon]

: My guess is that the server has some sort of "wakeup" functionality.

Yep!

: I also don't understand what a "remote unauthorized user" is.  Are they 
: authenticated to the powered-off system in some way?  Or could it be 
: just anybody with a network connection to the server?

I assume remote unauthorized attacker, not 'user' (bad choice of words).