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document updated 13 years ago, on May 1, 2011
Yes, this is black-hat stuff. But sometimes you run into super-locked-down machines (e.g. at Kinko's, or at the library), and wonder if it's possible to unlock them.

The key is that you have to be able to boot into your own USB or CD boot media. Of course, this is one of the keys of physical security, so it's unlikely, but just in case...