steam Link iPhone iOSでやってみた。
スゴイ！ほぼ遅延がない。あと高画質、ヌルヌル！
AppleTVでもやってみよ

1. download steam link from the app store
   
2. connect your steam account via entering the displayed pin

it can be that simple, the setup is self-explanatory. steam starts via apple tv in big picture mode. you can navigate through the library using siri remote, iphone/ipad or a suitable controller.

note: steam link does not turn apple tv into a game console, but provides an interface between the set-top box and a pc/mac. so the computer must be on and connected to steam for this to work. it is basically the host that is streamed to apple tv.