Real-time applications are typically built using web-sockets. However, it can be tricky to set up web-socket applications, especially if your application is behind a load balancer. The 3rd party Pusher service (www.pusher.com) makes it very easy to build real-time applications that allow you to broadcast messages on a 'channel'. All clients that subscribe to that channel will receive the message.

In this video we show how the UX component can be configured for real-time applications using the Pusher service.

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http://alphamediacapture.s3.amazonaws.com/videos/Pusher_Service_realTimeMessaging.zip