To add a second monitor in your Windows environment, simply press the new hotkey Win+P.
This is very convenient when you need to change the display settings during presentations with a projector that is connected to your laptop.
There are two methods to set up multiple monitors in Windows 7. Make sure that you connect the external monitors to your laptop or your desktop computer first.
Method 1: By keyboard shortcut “Win+P”
Press the Windows logo key + P on your keyboard. Select one of the following options: (The screen shot for this step is shown below).
Method 2: By the “Screen Resolution” menu
1. Right-click on an empty area of your desktop, and then click Screen resolution. (The screen shot for this step is listed below).
2. Click the Multiple displays drop-down list, and then select Extend these displays, or Duplicate these displays. Note If you cannot see the additional monitor(s) listed, click Detect.
If this does not work, try restarting your computer and repeat Steps 1 & 2 again.