How to Add Monitor to Extend Laptop Display

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1.In bottom right corner of Windows 7 screen, click Show Desktop button.

2. Right click on desktop. In dialog box, select Screen Resolution.
 
3a. Under Multiple displays, select Extend these displays, then click Apply

3b. A dialog box opens asking Do you want to keep these display settings? Click Keep changes. Then click OK.

4. After extending the displays, click the top of an application and drag it to the correct monitor.