Inspired by Joe Armstrong’s post, I’ve recently added websocket support to misultin v0.4, my Erlang library for building fast lightweight HTTP servers.
Basically, websockets allow a two-way asynchronous communication between browser and servers, filling the gap that some technologies such as ajax and comet have tried to fulfill in these recent years. If you want to try this out yourself, you will first need to grab a browser which implements websockets, such as Google Chrome.