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Usage notices
79
Arms and hands
•
When using the keyboard and touchpad, the shoulders
should be relaxed. The upper arm and forearm should form
an angle that is slightly greater than a right angle, with the
wrist and hand in almost a straight line.
•
Use a light touch when typing or using the touchpad and
keep the hands and fingers relaxed. Avoid rolling the
thumbs under your palms or supporting the wrists on the
desk while typing.
•
Use an external keyboard and mouse when using the
computer for long periods. When using an external
keyboard and mouse, position the devices at the same
height as the computer and within comfortable reach.
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