Having a second screen can help you see several open apps at once. You can also connect a projector so everyone in the room can see your screen.
After you connect a monitor or projector to your PC, you can:
Use the four corners of any screen with a mouse or the edges of touchscreens to open the Start screen, charms, and your recent apps.
Have more than one window open on each screen, with each window running an app.
Customize your screens by having taskbars on one or all displays, and moving apps between your screens.
You plug in most monitors and projectors with cables that match an available DVI, VGA, or HDMI port on your PC. If your PC has only one DVI port that's already in use, some PC makers include custom monitor cables that split the signal from one DVI port to two monitors.
A desktop PC needs a video card with two DVI, VGA, or HDMI ports.
If your monitor or projector has a cable that doesn’t match your PC, you can get an adapter to convert one type to another (for example, to help plug a DVI monitor into your VGA port or vice versa).
Locate an available video port on your PC.
Plug in the matching cable from the second monitor into the port.
Windows should automatically detect and install the monitor.
For wired connections, plug the projector cable into your VGA, DVI, or HDMI port. In most cases, Windows detects and installs the projector automatically.
You can also connect to a wireless projector when Windows detects one nearby. For more info about connecting a Miracast wireless projector, see Project to a wireless display with Miracast.
Swipe in from the right edge of the screen, and then tap Devices.(If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Devices.)
Tap or click Project, and then tap or click Add a wireless display.
Choose the projector in the list of devices found, and follow the instructions on the screen.
After you plug in your second monitor or connect a projector, you can choose your screen options.
Tap or click Project, and then choose one of these options:
PC screen only. You’ll see everything on your PC. (When you're connected to a wireless projector, this option changes to Disconnect.)
Duplicate. You’ll see the same things on both screens.
Extend. You'll see everything spread over both screens, and you can drag and move items between the two.
Second screen only. You’ll see everything on the connected screen. Your other screen will be blank.
After you have your second monitor or a projector set up to your liking, you might want to have more than one taskbar to make switching between apps and files easier on the desktop. Here's how to get taskbars on all of your displays and change how buttons appear on them.
Swipe in from the right edge of the screen, tap Search (or if you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search), and then enter Taskbar and Navigation in the search box.
Tap or click Taskbar and Navigation.
Under Multiple displays, select the Show taskbar on all displays check box, and pick each option you want for Show taskbar buttons on and Buttons on other taskbars.
Tap or click OK.
You can move apps between and around your screens.
If you have both a touchscreen and non-touchscreen monitor connected to your PC, you might need to change settings for your cursor.
Swipe in from the right edge of the screen, tap Search (or if you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search), enter Tablet PC Settings, and then tap or click Tablet PC Settings.
Tap or click Setup.
You might be asked for an admin password or to confirm your choice.
If you’re given a choice, tap or click Touch Input, and follow the on-screen instructions.