You can use an Apple TV with Airplay enabled Macs or iPods / iPhones / iPads to wirelessly share your screen with your audience – no need to be tied to a desk at the front of the room.
Likewise, students using their iPads can share their screen with the whole class.
Earlier versions of the Apple TV could only connect to iDevices that were connected to the same network. Model A1469 (released in 2013) with software updates applied, can connect directly to iDevices with iOS 8 installed, and Airplay-enabled Macs running the Yosemite (OSX 10.10) OS.
This is ideal for those travelling to multiple venues to make presentations.
Of course, you also need a display screen or projector with an HDMI input, to connect directly to your Apple TV output. If you don’t have an HDMI facility on your display or projector, you can use an HDMI to VGA converter. Not all of these work – the Kanex model is sold in the Apple Store, and appears to be the most reliable…
Alternatively, you can install Airplay software on a computer (Mac or Win) that is connected to your projector, and use this to display your Airplay-enabled device’s screen on the projector.
An advantage of this software option is that you can display multiple screens at the one time.