Using A Keyboard Tray Comfortably - HP MP4 User Manual

WRONG!
Do not position your keyboard and pointing device at different levels and distances.

Using a keyboard tray comfortably

If you use a keyboard tray, make sure it is wide enough to accommodate your pointing device, such as
a mouse or trackball. Otherwise, you will probably place the mouse on your desktop, higher and farther
away than the keyboard. This will lead you to stretch forward repeatedly, and uncomfortably, to reach
the mouse.
20 Chapter 3 Arranging your work area