2.Connect the other end of the cable to the digital display device.
3.Press fn+f4 to alternate the computer screen image between 4 display states:
●PC screen only: View the screen image on the computer only.
●Duplicate: View the screen image simultaneously on both the computer and the external device.
●Extend: View the screen image extended across both the computer and the external device.
●Second screen only: View the screen image on the external device only.
Each time you press fn+f4, the display state changes.
NOTE: For best results, especially if you choose the "Extend" option, adjust the screen resolution of the external device, as follows. Select Start > Control Panel > Appearance and Personalization. Under Display, select Adjust screen resolution.
NOTE: To remove the device cable, press down on the connector release button to disconnect 
it on the computer.
MultiStream Transport (MST) provides multiple display support from a single connector, the DisplayPort (DP), on your computer.
NOTE: With an Intel graphics controller, you can connect up to 3 display devices. To set up multiple displays, follow these steps:
Video 35