Sony VGN-AR170GU1 - Manual (Page 109)

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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.
If you want to work on your computer screen and the external display at the same time, see Using the Multiple Monitors
Function
(page 110) for more information.
To select a display
1 Right-click on the desktop and select NVIDIA Control Panel from the menu.
2 Click the Display icon.
3 Click Change Display Configuration.
4 Follow the on-screen instructions to change the settings.