I was looking for a platform where widgets developed using various technologies like Java can communicate with each other. In other words

When I add widgets to an interface I need them to talk to each other. For example A Click event in one widget should trigger an event in some other widget.

I have been looking into the web for solutions and ways to do it, but couldnt find anything concrete. Any pointers or information on this would be great. Something like this http://blogs.sun.com/pdblog/entry/inter_widget_communication_in_cross