The Password Security is a control panel that appeared on PowerBooks only. PowerBooks are protected from unauthorized use by means of this control panel. When activated, a password is required every time the Mac is turned on, and optionally when it wakes up. Security is very high with this control panel. Neither pressing the shift key during startup nor starting up from the Disk Tools diskette would get by the password prompt. Moreover, the password is never shown in any other form, except by a string of bullets (•••).