It raises interesting questions... like, would you want to? I suppose you could... on linux, which is architecturally similar to OSX, there's a process called killall that starts offing processes. If you typed in at lightspeed, ps -e | grep kill and killed the corresponding number, then maybe.you'd also have to do the equivalent of switching to runlevel 5 (or anything other than 6, the shutdown runlevel).
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One way is to get it to go to sleep before it shuts down.
Theoretically possible, but not technically.