HP 2240 - Manual (Page 37)

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You can use an HP three-button mouse (PS/2), a trackball, or other
options as pointing devices with your workstation by using the serial
ports. For instructions on using your particular pointing device, see
the manual that came with it.
For general information on using three-button mice and on the vari-
ous cursor shapes associated with different areas of HP VUE while
using a mouse, see Using Your HP Workstation.
Pointing Devices