Sony VAIO VGN-CR - Manual (Page 78)

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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 79) for more information.
To select a display
1 Right-click on the desktop and select Personalize.
2 Click Display Settings.
3 Follow the on-screen instructions to change the settings.
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You may not be able to display the same contents on your computer screen and the external display or projector at the same time, depending on the
type of your external display or projector.
Before turning on your computer, turn on the external display.