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You may know that AirPlay is a technology built into your iOS devices that allows you to stream audio and video over WIFI to an AirPlay compatible device like an Apple TV or AirPort Express. A common classroom application of this is to have an Apple TV connected to a flat screen display, or HDMI projector so that the teacher can stream wirelessly from an iPad or iPhone 4 to the display for showing presentations, websites, or videos. It is a great advantage for a teacher to be able to teach from the iPad without being tethered to the projector.
To turn on AirPlay you will need to have both devices connected to the same WIFI network. On the iPad swipe up with four fingers to see your recent applications (or double tap the home button), swipe right to see your controls and you will see the AirPlay button. Tap the button to chose the device to stream to.
Another tool related to AirPlay that is useful to teachers is an application called Air Server. This is a program that you can install on your Mac or Windows computer that turns your computer into an AirPlay device, meaning that you can have your computer hooked to a classroom projector, and then stream wirelessly from your iPad or iPhone 4 to your computer that is being displayed on the projector. This is a great way stream wirelessly from your iPad even if you don’t have an Apple TV and HDMI display available in your classroom.