How do I extend my Android device as a second display on a Windows PC?

Please refer to the following instructions:

1. Download XDisplay Agent for PC.(http://www.splashtop.com/wiredxdisplay)
2. Wired plug your Android device to your PC, make sure your device is detected, and open the Wired XDisplay app. If your device isn't detected, please try using a different cable.
3. Hit Windows Key + P, then select Extend displays
4. Also, please make sure that on Advanced tab of WiredXDisplay, the Enable mirror mode option is unticked.
5. If the screen is mirrored instead of extended, please make sure Virtual Display Driver is installed.
6. If you can't install the driver on the app, please go to C:\Program Files (x86)\Splashtop\Splashtop Wired XDisplay\Agent\Drive to install the driver

7. If the screen is still not extended after the driver is installed, please try adjusting your compatibility setting:  go to  C:\Program Files (x86)\Splashtop\Splashtop Wired XDisplay\Agent\SWXDAgent.exe, right click to go to Properties > Compatibility tab>Compatibility mode, tick Run this program in compatibility mode for:, choose "Windows 7"