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The only thing I can think of is to do it using http push or comet.
- Source page that spawns popup has jquery requesting blah.php every second waiting for a value of "true"
- Source page loads popup
- Popup shows whatever, onUnload it runs a script to set blah.php to true
- Source page get's it's true signal and does whatever
Can be made more "live" using http push but that's the idea basically here.
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