A framework that can natively communicate with a browser via mechanisms like Comet or WebSockets. An example is when a new message is posted to an inbox on the

A framework that can natively communicate with a browser via mechanisms like Comet or WebSockets. An example is when a new message is posted to an inbox on the server, and your browser immediately updates the message count without polling. Non-realtime frameworks often have to resort to communicating with websockets over something like zeromq.