Sony VAIO VGN-FW200 User Manual page 78

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Using Peripheral Devices
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You can also change the S1 button assignment to activate the Multiple Monitors function with the S1 button. To change the S1 button assignment,
press and hold the S1 button to display the window for changing the assignment. For details on the S1 button, see Using Special-function Buttons
(page 32).
Additionally, you can set the display colors and resolution for each display and customize the Multiple Monitors function.