Sony VGN-P21S/W User Manual page 82

Using Peripheral Devices >
Using the Multiple Monitors Function
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You can also change one of the S button assignments to activate the Multiple Monitors function with the corresponding S button. To change the S
button assignments, press and hold either S 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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