Apple Macintosh PowerBook 190 Series - Manual (Page 137)

Some computer users may develop discomfort in their hands, wrists, or arms
after intensive work without breaks. If you begin to develop chronic pain or
discomfort in your hands, wrists, or arms, consult a qualified health
specialist.
m Change hand positions often to avoid fatigue.
m If you prefer, you can adjust the elevation of the keyboard by lowering the
feet until they snap into position.
The back of the keyboard is slightly elevated when the feet are in use.
Otherwise, the keyboard is level.
Mouse
m If you use an external mouse, position the mouse at the same height as
your keyboard. Allow adequate space to use the mouse comfortably.
To lower the foot, lift the rear of the
computer and press the release button.
The foot extends automatically. To raise the foot, press the release
button while pushing up on the foot
until it clicks into place.
131 Health, Safety, and Maintenance Tips