Sony VGN-FW4 User Manual page 79

Using Peripheral Devices >
Using the Multiple Monitors Function
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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.
Additionally, you can set the display colors and resolution for each display and customize the Multiple Monitors function.
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