Sony VGN-NS10E/S User Manual page 77

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Using Peripheral Devices
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You can also change the muting (S1) button assignment to activate the Multiple Monitors function with the muting (S1) button. To change the muting
(S1) button assignment, press and hold the muting (S1) button to display the window for changing the assignment. For details on the muting (S1)
button, see Using Special-function Buttons (page 34).
Additionally, you can set the display colors and resolution for each display and customize the Multiple Monitors function.