Embed one GWT application into another.

I am trying to build a embedding architecture in GWT.

1.) A Base GWT application will define the header, footer and possible sidebars.
2.) A Couple of Functionality GWT applications in the center panel which responds to the actions done on the header/ side bar.

So basically I want to embed my functionlity application into base application. I am assuming the communication can happen through some kind of request.

I am sure many of you have developed an architecture like this. I am struggling because I am very new to GWT.
Please throw some light on this architecture. Is it good/bad/impossible :)

Thanks,
Pradeep

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