OS X Mavericks takes full advantage of every display connected to your
Mac, giving you even more flexibility to work the way you want. There’s no longer a primary or secondary display — now each has its own menu bar, and the Dock is available on whichever screen you’re working on. You can have multiple app
windows running on either display. Or run an app full screen on each one. Even show a desktop on one display and a full-screen app on another. Mission Control can give you a bird’s-eye view, making it easy to drag what you want where you want it. You can even drag it across the room, because now AirPlay and
Apple TV can wirelessly turn your HDTV into a fully functional display.