Apple PC Compatibility Card - Manual (Page 196)

To set a new hot key, follow these steps:
1 In the Mac OS environment, open the PC Setup control panel.
2 Click the Hot Key text box.
3 Type the command you want to use to switch environments.
The x key is automatically included; you type the additional characters you
want. For example, you might type Option-Tab, setting the switch command
to x-Option-Tab.
Some character combinations cannot be used. The PC Setup control panel
will alert you if you select a reserved key combination.
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