Do what? Boot from a firewire CD drive, or screw up their systems with Norton?
Computers manufactured after the G4 Yikes! machines have the ability to boot from FireWire devices, including CD drives. You may need to hold down the 'c' key while booting, or, if that doesn't work, try Shift-Command-Delete (it may also be Shift-Command-Option-Delete -- and that's the big delete key by the "+ =" key, not the little delete key by the numeric keypad). That will force the computer to look for external devices from which to boot.