Sony VGN-S570P - Manual (Page 71)

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Using Peripheral Devices
Selecting Display Modes
You can select which display to be used as the primary monitor when an external display (desktop monitor, etc.) is connected
to your computer.
The procedure for selecting a display depends on the video controller used in the computer. See the online Specifications
for detailed information on the video controller.
If you want to work on the computer's LCD and the external display at the same time, see Using the Multiple Monitors
Function
(page 74) for more information.
To select a display