Using The Touchpad; Using An External Mouse - HP COMPAQ 309971-002 Hardware Manual

3. Push a replacement cap into place.
Replacing the pointing stick cap

Using the TouchPad

To move the pointer, slide your finger across the TouchPad
surface in the direction you want to move the pointer. Use the left
and right TouchPad buttons as you would the left and right
buttons on an external mouse.

Using an External Mouse

An external USB mouse can be connected to the notebook using
one of the USB connectors on the back panel. An external PS/2 or
USB mouse can be connected to the system using the connectors
on an optional HP Port Replicator or an HP Advanced Port
Replicator.
Hardware Guide
Pointing Devices and Keyboard
2–3