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Ajax is like so many things in the web world - a simple (but very powerful) hack that isn't defined by a spec. With the advent of the web socket API, we'll finally have a native way to have bi-directional communication with the server. As we create richer and richer clients, we're writing more and more JavaScript. While the JS engines are getting faster and faster, there are cases where it'd be very handy to run scripts in the background. Web workers give us just such an opportunity.