Using A Palm Rest - HP MP4 User Manual

Another option is to use forearm supports only when pausing, allowing your forearms and hands to float
freely while typing and pointing. In this case, the support is properly adjusted when it is slightly below
your forearm typing position but close and available for pauses (such as when you are reading from the
screen). Experiment with the height of your arm supports to find which approach is most comfortable
for you. Let the comfort of your neck, shoulders, elbows, arms and wrists be your guide.

Using a palm rest

A palm rest (sometimes called a wrist rest) is designed to provide support during pauses, not during
typing or pointing. While typing or while using a pointing device, keep your wrists free to move and not
anchored or resting on a palm rest, the work surface, or your thighs. Resting your palms while typing
may be harmful because it can cause you to bend and hold your wrists and fingers back. It can also
apply pressure to the underside of your wrists. Refer to the
section.
22 Chapter 3 Arranging your work area
Forearms, wrists, and hands on page 13