System & Disk UtilitiesBootPicker
BootPicker runs on startup immediately prior to LoginWindow. Based upon your configuration, it presents an option to the end user to choose an operating system. Upon choosing that OS, the machine either continues to Mac OS X or reboots to the specified OS. The next time the computer is rebooted, it automatically returns to Mac OS X and the boot picker. Finally, for environments that require management at a large scale, or management while the machines are turned off or booted to a different OS, BootPicker can be managed via a Mac OS X Server Open Directory Master.
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