Sony VGN-FW170J - Manual (Page 85)

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Using Peripheral Devices
Models with the ATI video controller
1 Click Start and Control Panel .
2 Click Adjust screen resolution under Appearance and Personalization .
3 Click the monitor icon marked 2 .
4 Select the Extend the desktop onto this monitor option.
5 Click Apply and then OK .
If the Monitor Settings window appears, click Yes .
✍
You can set the display colors and resolution for each display and customize the Multiple Monitors mode.