Sony VAIO VGX-TP - Manual (Page 79)

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Using Peripheral Devices
Selecting Display Modes
You can select which display to be used as the primary monitor when two displays (TV, desktop monitor, etc.) are connected
to your computer.
If you want to work on both displays at the same time, see Using the Multiple Monitors Function (page 80) for more
information.
To select a display
1 Click Start and Control Panel.
2 Click Additional Options.
3 Click NVIDIA Control Panel.
4 Select the display setup option under Display.
5 Follow the on-screen instructions to change the settings.
✍
You may not be able to display the same contents on both displays (including a combination of one display and one projector) at the same time,
depending on the type of your display or projector.
Before turning on your computer, turn on the external display.