My GWT application has an entry point module Main.
Main has a class method refresh() to refresh its menubar.

Main also is able to be triggered to popup a DialogBox, where the
DialogBox contains and NamedFrame.

The NamedFrame is given the URL to another entrypoint module User
within the same application.

I need User to be able to trigger the refresh() of the instance of
Main.

On which frame does Main reside. How is User instance triggered by
Main instance able to refer to that Main instance thro JSNI? In JSNI
terms, what frame should User refer to?:

native public void refreshMain() /*-{
  [which [email protected]::refresh();
}-*/;

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