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Welcome to WebmasterWorld!
You should be able to use something like this to reference the form value:
window.opener.document.forms[0].myArea.value;
The window.opener refers to the window that opened the current one. From there, you can access the document element, and from there, anything else exactly like you would as if it were on the current page. Hopefully this gets you closer to where you need to go.
Chad