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Open the Firmware

   PowerPC-based Macs use a proprietary system for controlling direct hardware access by the system, called "Open Firmware". This performs in a similar manner to a PC's BIOS. The easiest way to get around all of the access control mechanisms and passwords of a computer's operating system is to go around. Booting a computer to an alternate operating system can allow direct access to a computer's hard drive without any barriers. The BIOS has the ability to password protect the boot sequence as well as the boot device option.