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Here we are in the Display System Preference . This particular computer is a MacBook Air with an external display hooked up to it, and of course, yours may look a bit different than mine. Now, as I mentioned, you can attach more than one monitor to your Mac, or a projector, or in some cases, an HDTV with an HDMI port. When you do that, you're going to see this arrangement tab. Click on that arrangement tab and you'll see the number of monitors you have here. If you choose to mirror displays, and that means having the same image on each display, they'll be placed on top of each other as you see here.
If you uncheck this option, the two of them will go side by side and you can move the images around. So, for example, in a two-monitor setup you may have one on the left and one on the right, you want to make sure that that left monitor appears that way in this display and the right monitor appears to its right. When you have these multiple displays, you'll have a different display window for each display. Heres one for an HP display, and here's one for the native display on this MacBook Air. Within these, you can change the resolution of each display, and you can also change the color.
This is helpful because, oftentimes, when you have two displays, you want them to look similar. And in the case of different manufacturers, you may have to tweak those color settings a little bit. Now, some newer Mac laptops include this AirPlay Mirroring option. When you click on this, any Apple TVs on your local network will appear, and I have one here, so I can select Apple TV. Again, I'm not actually going to enable it because it will change the resolution on our display now. When you choose this, the picture that's displayed on your Mac will be projected wirelessly to that Apple TV, and what good is this? Well, to begin with, it's a nice option for doing presentations to an HDTV if you do that sort of thing for your business.
But it's also great for home use and that AirPlay Mirroring will display everything on your Mac screen, and that includes things like streaming movie and TV services that you can access through a Mac's web browser but not on an Apple TV. Through AirPlay Mirroring, you basically bring a rich multimedia experience to a television. And that's single, dual-monitor, and Apple TV configuration within the Display System Preference.
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