Using The Dual Pointing Device (Dual Models) - Compaq Evo N620c Series Hardware Manual

Using the Dual Pointing Device (Dual Models)

By default, the pointing stick and TouchPad components can be
used interchangeably.
Using the Pointing Stick Components
To move the pointer, press the pointing stick 1 in the direction
you want to move the pointer.
Use the left 2 and right 3 pointing stick buttons as you would the
left and right buttons on an external mouse.
Using the TouchPad Components
To move the pointer, slide your finger across the TouchPad
surface 4 in the direction you want to move the pointer.
Use the left 5 and right 6 TouchPad buttons as you would the
left and right buttons on an external mouse.
Identifying dual pointing stick–TouchPad components
Hardware Guide
Pointing Devices and Keyboard
3–3