It&#x27;s a network-attached browser engine on a TV.  You can stream video, sure, but you can also load up an arbitrary webpage and render to the TV using standard web technologies.  People have built multiplayer games played with multiple people&#x27;s phones with the Chromecast as a shared area, such as card games.  You could trivially show a persistent status page.  Almost anything you can do with web technologies you can do on a Chromecast.  (Notable exceptions: WebGL, and applying arbitrary transforms to live video.)<p>And in addition to client&#x2F;server communication, you can easily send and receive messages between the page running on the Chromecast and the app or page that initiated that cast.