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You can use http://autobahn.ws/python/, more precisely WAMP implementation.
I think a pubsub pattern (http://wamp.ws/faq/#pubsub) is suitable for you.
Javascript mobile clients will be connected to your server to listen changes.
When one of users changes button, he will send request via websocket and other users, who was subscribed, will recieve these changes.
If you wish to publish events via django, you should use non-blocking stuff such as https://github.com/itamarst/crochet.
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