Sony VGN-TXN27N - Manual (Page 81)

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Using Peripheral Devices
To select the Multiple Monitors mode
1 Right-click on the desktop and select Personalize from the shortcut menu.
2 Click Display Settings.
The Display Settings window appears.
3 Follow the on-screen instructions to change the settings.
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Additionally, you can set the display colors and resolution for each display and customize the Multiple Monitors mode.