Sony VAIO VGN-CS - Manual (Page 82)

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Using Peripheral Devices >
Selecting Display Modes
Selecting Display Modes
When an external display is connected, you can select either your computer screen or the connected display to use as the
primary monitor.
If you want to work on your computer screen and the external display at the same time, see Using the Multiple Monitors
Function
(page 84) for more information.
The procedure for selecting a display depends on the video controller used in the computer.
See the specifications to find out about the configuration of your computer.