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Article:
  Securing Your TiBook (or Any Other Mac OS X Machine)
Subject:   A key-combo side note...
Date:   2003-02-19 00:26:44
From:   anonymous2
The boot up key sequence: [command] + [option] + [shift] + [delete] was stated as a way to boot from a cd. This is true, but it is more accurately described as telling the machine to ignore the default boot device and to boot from the next bootable device it can find. I am not sure how the sequence works for ATA or ATAPI. It may check all masters then all slaves, or it may go master / slave, master / slave, ect. On SCSI it would progress from sequentially up the chain to find a bootable device.