Apple Mac Performa 640 series - Manual (Page 57)

Pointing device
The standard Macintosh pointing device (such as a mouse or trackball) has
one button; most PC devices have two. The button on the Macintosh pointing
device behaves like the left button on a PC device.
m To simulate the right button, press the = key on the keypad.
m To simulate pressing the left and right buttons at the same time, press the
mouse button and the = key simultaneously.
If you have Windows installed, you can use its Mouse control panel to switch
the button assignment.
Note: DOS does not come with a mouse driver. A mouse driver for Windows
is installed on your system along with Windows, however.
Keyboard
The DOS-compatible Macintosh works with all Apple keyboards. In the PC
environment, you can use the Option key on an Apple keyboard as the
equivalent for the Alt key on a PC keyboard.
You can use the Apple Extended Keyboard and the AppleDesign Keyboard
normally. With the Apple Keyboard II, use the following equivalents for keys
on a PC keyboard. These equivalents also apply to the Apple Adjustable
Keyboard if the function key keyboard isn’t plugged in.
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