This is nowadays, a very simple task. If you have a PC (Desktop) computer that is 2007 onward, it should have multiple video outputs right on there.
Look at the rear of the computer tower or desktop, there should be a cable plugged in from the monitor to the tower.
It will be either:
- VGA (older type)
- DVI
- HDMI (newest type)
Now, your current monitor will be hooked up using one of these cable types already, all you have to do is get another monitor with the corresponding connectors to suit your graphics card, and no, you cannot run 3 monitors off the one card if there are 3 connectors (heads). The card will only run 2 monitors simultaneously. You will need another graphics card installed to handle more than 2.
Always turn off your computer to try adding another monitor.
Upon starting your computer with two monitors plugged in, your operating system will choose a "master monitor" to display on, until the graphics drivers are loaded.
When you have your desktop started up, logged in and running, go to your graphics options in the control panel to configure your new monitor.
Choose the new monitor and select "Extend my desktop to this monitor".
Most graphics cards will do all or most of this process for you, depending on what driver and card you have.
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