Apple Boot Camp (Mac OS X v10.5 Leopard) - Manual (Page 14)

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To set the default operating system in Windows:
1 In Windows, click the Boot Camp system tray item and choose Boot Camp Control
Panel.
Note: Your screen may look different, depending on which computer you’re using.
2 Select the startup disk with the operating system you want to use by default.
3 If you want to start up that operating system now, click Restart.
To restart in Mac OS X using the Boot Camp system tray item:
m In Windows, choose “Restart in Mac OS X” from the Boot Camp system tray item.
Restarting in Mac OS X using the Boot Camp system tray item also sets the default
operating system to Mac OS X.
Selecting an Operating System During Startup
You can select which operating system to use during startup by holding down the
Option key. This displays icons for all available startup disks, and lets you override the
default setting for the startup disk in Startup Disk preferences (Mac OS X) or the Boot
Camp control panel (Windows) without changing that setting.