Sony VGN-FW170J - Manual (Page 82)

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Using Peripheral Devices
Models with the ATI video controller
When the computer has an external display connected, you can change the Main/Clone setting as follows:
1 Click Start , All Programs , and Catalyst Control Center .
2 Click CCC .
3 Follow the on-screen instructions to change the settings.
See the help file for more information.
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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.