HP Compaq Presario CQ56-110US Notebook PC - Manual (Page 30)

Function Action key
Press and hold f2 to decrease the screen brightness level incrementally.
Press and hold f3 to increase the screen brightness level incrementally.
Press f4 to switch the screen image among display devices connected to the computer. For example,
if a monitor is connected to the computer, pressing this key alternates the screen image from the
computer display to the monitor display to simultaneous display on both the computer and the monitor.
Most external monitors receive video information from the computer using the external VGA video
standard. The
f4 key can also alternate images among other devices that are receiving video
information from the computer.
Press f5 to play the previous track of a CD.
Press f6 to play, pause, or resume a track of an audio CD.
Press f7 to stop the audio playback of a CD.
Press f8 to play the next track of an audio CD.
Press and hold f9 to decrease speaker volume incrementally.
Press and hold f10 to increase speaker volume incrementally.
Press f11 to mute or restore speaker sound.
Press f12 to turn the wireless feature on or off.
NOTE: This key does not establish a wireless connection. To establish a wireless connection, a
wireless network must also be set up.
Refer to (1) through (5) in Keys on page 7 for information on using the application quick-launch keys.
22 Chapter 4 Pointing devices and keyboard