Pulling Data From a GWT application

From a host page, how would I pull data that is in a GWT application?
If there is already a link that discusses, please let me know. For
example, I have a button on a host page and I want to write code for
when you click on that button that pulls a specific value out of the
GWT application. What is the best way to do that?

Any advice would be great!
Thanks in advance.
Jim

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