Many workstations are delivered and set up with two monitors, or a laptop and a monitor. You can manage how content is displayed on these monitors by change the settings.
To start right click on you desktop background in an area that is free of icons and you will get this menu:
Choose screen resolution. It will bring up the following menu.
Here you have many options, if you click on Identify in the top right hand corner, it will flash large numbers on your monitors telling you which is 1 and which is 2. To use both displays as one really large screen click Extend these Displays. To see the same exact thing on both screens