Sony VGN-Z11AWN/B User Manual page 96

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Using Peripheral Devices
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For selecting a video controller, see Selecting Performance Modes (page 107).
You can also change one of the S button assignments to activate the Multiple Monitors mode with the corresponding S button. To change the S button
assignments, press and hold any S button to display the window for changing the assignment. For details on the S buttons, see Using Special-function
Buttons (page 35).
Additionally, you can set the display colors and resolution for each display and customize the Multiple Monitors mode.