Getting the Window, which opened my GWT module

Dear all,

I have a GWT module, which is to be called from someone else's web page (not GWT). Within my application, I have a button, and when the user presses the button, I want a String to be passed back to the calling page, and have this String inserted there into a textarea.

I have tried getting the target text area like this, using JSNI in my GWT program:

window.opener.document.getElementById('fred');

but window.opener is not set.

Is what I am trying to do at all possible?

Thank you for your attention.

Michel

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