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Yeah on a Mac you hold down the Option key and it boots into Open Firmware and then there is a GUI where it shows a list of drives that have a system on it and you boot from whatever drive by clicking on it. It can be FireWire, ATA, SCSI, and Serial ATA, but not USB for some odd reason.
You can also Hold the Command and S keys at the same time at boot to boot into the *nix command line and not have those annoying pretty icons in that goes along with a GUI.
I installed Panther into my iPod and can boot from it in an emergency.
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