HP Compaq Presario,Presario CQ40-600 User Manual page 12

Component
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(2)
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There is an unmarked scroll zone inside the right edge of the TouchPad. To scroll up and down using
the TouchPad vertical scroll zone, slide your finger up or down inside the right edge of the TouchPad.
For more information about TouchPad features, refer to "Using the TouchPad" section later in this guide.
2 Chapter 1 Features
TouchPad off indicator
TouchPad zone
Left TouchPad button
Right TouchPad button
Description
To switch the TouchPad on and off, quickly double-tap the
TouchPad off indicator.
NOTE: When the TouchPad is active, the light is off.
Moves the pointer and selects or activates items on the screen.
Functions like the left button on an external mouse.
Functions like the right button on an external mouse.