Possible to lock shut down sequence?

Hi, I was wondering if it's possible to prevent my computer from shutting down (either with a password or some other form of security). My roommate continues to turn off my computer as a prank (I've tried reasoning) but they consistently do it. I was wondering, can I put a lock on the shut down sequence so they can't turn off the computer without me?

Do you log out of your account when you're done using the computer?
Setting the computer to request authentication (username+password) when it wakes from sleep or screensaver could help.
However, if your roommate physically forces the machine to shut down by holding the power button or removing the cord, there's nothing you can do. You'll want to check your computer's hard drive for errors often, just in case.
You may want to start shutting it down yourself when you leave.
~Lyssa

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David

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http://docs.info.apple.com/article.html?artnum=95165
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Possible to lock shut down sequence?

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