I learn GWT since 2 weeks. My last lesson concerned MVP, here:
http://code.google.com/intl/fr/webtoolkit/articles/mvp-architecture.html

Dealing with the example given by google in the tutorial, I don't
understand the use of eventBus, who is a instance of HandlerManager in
the AppController.

Is it a bad thing to develop a app without eventBus ? Can I remove all
"eventBus" things and directly handle event by calling method ? Like:
"button --> click --> call of a method (like "AddContact").

Because eventBus just create new instance of a event. I don't discern
the purpose of it.

Many thanks in advance.

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