Sony VGN-SR490DDB - Manual (Page 103)

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Using Peripheral Devices >
Selecting Display Modes
❑ On 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.