The Apple TV and AirPlay uses private APIs in OS X to get it's screen updates. These APIs are not public. We would LOVE to have access to this API as we could make an improved USB display solution without the issues that are seen today.
This has been discussed with Apple but they have been unwilling to give access to this private API. As you might understand this is very frustrating for us, as it makes our solution doesn't perform as well as it could because we're locked out of a private API.
Wim
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