HP Compaq Presario,Presario 1515 Supplementary Manual page 24

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Select a work surface or surfaces that are large enough to hold the computer equipment
and any additional items required for your work. To help minimize eye fatigue, position
any materials to which you frequently refer at about the same viewing distance.
Arrange your frequently used papers, books, or other items to minimize the distance
you reach for them. If you frequently refer to books, papers, and writing materials, and
if you use a keyboard tray, make sure the tray, when extended, doesn't cause you to lean
forward or reach excessively. This can stress your shoulders and back. If you find that
such stress occurs, you may want to consider a different type of work setup.
If you use a document holder, position it near the monitor at the same distance, height,
and angle as the monitor. Positioning the holder in this way can increase your neck
comfort as you refer back and forth between your papers and the display screen, by
helping you keep your head balanced over your shoulders.
If your primary task is typing from paper documents, you may find it more comfortable
to place your document holder directly in front of you and your monitor slightly to one
side, or on a slant board between your monitor and keyboard. Consider this option only
if you spend more time looking at the paper than at your monitor.
Don't arrange your work area in a way that causes you to
repeatedly strain forward to see and reach frequently used
items such as books, papers, or a phone.