How to stream from a Mac to an Apple TV with no Wi-Fi

[iMore.com]

iOS 8 introduced peer-to-peer AirPlay streaming between iPhone, iPad, and third-generation Apple TVs. What about the Mac?
The Apple TV is capable of streaming video content over the Internet or content that's stored locally on host Macs or Windows PCs connected to the same Wi-Fi network. But what if there is no local Wi-Fi network? Well, this week, I'm actually coming to you with a question, because I'm stumped.

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