Sony VGN-SZ300 - Manual (Page 30)

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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
S1/S2 buttons
By default, the S1 button turns the volume on and off and the S2 button lowers the CPU speed to reduce the
fan noise. You can change these button assignments on the window for changing the S button assignments.
To display this window, press and hold either button or launch and navigate through VAIO Central.