Sony VGC-RT100Y - Manual (Page 117)

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Using Peripheral Devices
To use the Multiple Monitors function
1 Click Start and Control Panel.
2 Click Adjust screen resolution under Appearance and Personalization.
3 Right-click the number 2 monitor and select Attached.
4 Click OK.
At the confirmation prompt, click Yes.
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Additionally, you can set the display colors and resolution for each display and customize the Multiple Monitors function.