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How do you tell how many popups you have open ?

 
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I have a web app that allows the user to open 1+ popups at any given time. If I need to close them with JavaScript, can I find how many are open ? They are all opened using the same JavaScript function.
 
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If you do it like the way I said in my first post here with the array: https://coderanch.com/t/115552/HTML-JavaScript/Closing-windows-JavaScript

Eric
 
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