They really just need to send the Netflix cookie from your browser to the chrome cast. But I don't think they do that, like sarnowski said, i believe they put s

They really just need to send the Netflix cookie from your browser to the chrome cast. But I don't think they do that, like sarnowski said, i believe they put some data in the url thats like a 1 time key for your account and the video you want to watch.