HP Compaq Series Hardware Manual page 26

Switching Displays (fn+f4)
The hotkey switches the image among display devices
fn+f4
connected to the external monitor connector or the S-Video-out
jack on the notebook. For example, if an external monitor is
connected to the notebook, pressing the
times will toggle the image between the notebook display and an
external display. The Intel Extreme Graphics 2 for Mobile display
utility offers additional configurations. To access the Intel
Extreme Graphics 2 for Mobile display utility:
In Windows XP, select Start > Control Panel > Appearance
and Themes > Display > Settings > Advanced > Intel
Extreme Graphics 2 for Mobile.
In Windows 2000, select Start > Settings > Control Panel >
Display > Settings > Advanced > Intel Extreme Graphics 2
for Mobile.
Most external monitors receive video information from the
notebook using the external VGA video standard. The
hotkey can also toggle images among other devices receiving
video information from the notebook.
The following five video transmission types, with examples of
devices that use them, are supported by the
LCD (notebook display)
External VGA (most external monitors)
S-Video (televisions, camcorders, VCRs, and video capture
boards with S-Video-in jacks)
Composite video (televisions, camcorders, VCRs, and video
capture boards with composite video-in jacks)
DVI-D (external monitors that support the DVI-D interface)
Composite video and DVI-D devices can be connected to the
notebook only when it is docked in an optional Advanced Port
Replicator.
Hardware Guide
Pointing Devices and Keyboard
hotkey multiple
fn+f4
fn+f4
hotkey:
fn+f4
2–5