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Trying doing a kind of RIA with a lot XHR (so called Ajax) messaging (very similar to Bayeux), I recently dived into what makes me enjoying working with jQuery. It’s two methods: bind (to bind an event like click, mouseover…) and trigger (to fire that event). They aims to solve the problem identical to the one of the GoF’s pattern called: Observer pattern. YUI has got a more pure implementation called CustomEvent that powers the AjaxEvent blogged by (awesome) Tim a time ago and Dojo’s one is very similar to jQuery’s.