Treo includes a keyboard backlight for nighttime use. The keyboard backlight activates automatically when the screen turns on, but shuts off if the keyboard is not in use. When the screen is on, press Option then the P key to manually activate the keyboard backlight.
Turning Treo on and off
You can use the Palm OS features of your Treo independently of the wireless features and applications. Therefore, the screen and Wireless Mode are designed to be turned off and on separately.
Turning the screen on and off
1.Press the Screen button 
to turn on the screen.
2.Briefly press the Screen button 
to turn off the screen.
Turning Wireless Mode on and off
Wireless Mode allows your Treo to connect to a mobile network so that you can make and receive phone calls and use other wireless services.
1.Press and hold the Wireless Mode button 
to turn on Wireless Mode. You will hear a series of ascending tones. When Wireless Mode is on, your Treo connects to a mobile network, and you can use the phone and Internet features (if supported by the local network).
2.Press and hold the Wireless Mode button 
again to turn off Wireless Mode. You will hear a series of descending tones. When Wireless Mode is off, your Treo does not have a connection to any mobile network. You can still use the organizer and other Palm OS features. This is ideal for airplane flights and for maximizing battery life.
