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IFrame (Wikipedia): an HTML element which makes it possible to embed another HTML document inside the main document.

Widget (Wikipedia): a portable chunk of code that can be installed and executed within any separate HTML-based web page by an end user without requiring additional compilation.

What exactly are you trying to ask? You can certainly exchange data via a database and 'make it feel interactive' between the frames using JavaScript/AJAX.

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I have a Facebook page with an iframe containing a gwt widget. How do I transfer data to the gwt widget? I know what this data is when I am generating the Facebook page, so I was hoping there's an easy way to do this without having the gwt widget contact the server to get its input.

I also need to get data back from the gwt widget. How should it send this data back to the server?

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