In the case that one client can be connected to the receiver (I don't know enough to know if this is a correct assumption), the receiver acts on content that is streamed to it. If other people playing the same game, pushed their interactions to a server that also is serving the receiver, the receiver's content would be updated with all the players interactions. Clients could be updated with pubsub socket connections, and the receiver has a stream from the server. I bet there is good potential for gaming with Chromecast.