Booting a DMG from a USB Flash Drive?

Is there anyway I can boot from a USB flash drive? I don't have a DVD burner to burn the image onto, so I have to resort to this. I'm running an Intel iMac (late 2006) on Tiger.
Any help is appreciated.

If you mean boot up your Mac then the answer is no. If you mean open a .dmg file then the answer is yes.

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