Sony VAIO VGN-SZ700 - Manual (Page 93)

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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 95) for more information.