Launching applications
Each of the three application buttons on the front of the Treo can be used to launch two applications. To access a button’s primary application, simply press the button. To access a button’s secondary application, press Option 
, then press the application button. The fourth button turns the screen on and off, and controls the keyguard.
You can also customize the buttons yourself; see page 117 for details.
Your mobile service provider may have customized the applications associated with each button.
