If you work with multiple programs at once, you can use dual monitors to extend the desktop and place some of the windows on the second screen. You can also duplicate the desktop on the second screen. If you don’t plan on working with multiple programs for a few hours, there is no need to have both monitors powered on. In this case, you can toggle from dual monitors to a single monitor with just a few keystrokes. Windows 7 is able to manage multiple monitors, but your video card software can also include a utility that enables you to control multiple displays. Tips Writer Bio
