Apple PowerBook (2400c) User Manual download pdf (Page 126)

Keyboard and trackpad

m When you use the keyboard and trackpad, your shoulders should be

relaxed. Your upper arm and forearm should form an approximate right

angle, with your wrist and hand in roughly a straight line.

m You may have to raise your chair so your forearms and hands are at the

proper angle to the keyboard. If this makes it impossible to rest your feet

flat on the floor, you can use a footrest with adjustable height and tilt to

make up for any gap between the floor and your feet. Or you may lower

the desktop to eliminate the need for a footrest. Another option is to use a

desk with a keyboard tray that’s lower than the regular work surface.

m Use a light touch when typing or using the trackpad and keep your hands

and fingers relaxed. Avoid rolling your thumbs under your palms.

Some computer users may develop discomfort in their hands, wrists, or

arms after intensive work without breaks. Therefore, it’s a good idea to

change hand positions often to avoid fatigue. If you begin to develop

chronic pain or discomfort in your hands, wrists, or arms, consult a qualified

health specialist.

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Appendix A

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Apple PowerBook (2400c) User Manual Page 126