Sony VAIO VGN-NS - Manual (Page 34)

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Using Your VAIO Computer
Using Special-function Buttons
Your computer is equipped with special buttons to help you use specific functions of the computer.
Special-function button Functions
Muting (S1) button
By default, the muting (S1) button turns the volume on and off.
✍
To change the muting (S1) button assignment, press and hold the button or click Start and VAIO Control Center to display
the setup window.
AV MODE button
Launches the VAIO Launcher for selecting the desired software.
You can change the default software options in the VAIO Launcher. To do so, press and hold the AV MODE
button to display the setup window.