So I noticed that when I was "streaming" some types of video from my iPhone or iPad to my Apple TV that it never ran the battery down or appeared to use a lot of processing power on the device. I looked it up and as I suspected when the video isn't on the device but is coming from a provider's website the Apple TV is actually getting the video directly from the Internet rather than streaming it from or through the device. This even works when you have to be signed in to the website to view content. How does this work? Clearly the iPhone or iPad is somehow "transferring" your credentials to the Apple TV but how?