Q1610 How do I refrence a JavaScript varible in an opener window from the popup window?

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In the opener window:

<script language="JavaScript"><!--
var a_variable = 'Hello world';

var windowReference = window.open('popup.htm','windowName');

if (!windowReference.opener)
  windowReference.opener = this.window;
//--></script>

And then in popup.htm:

<script language="JavaScript"><!--
alert(opener.a_variable);
//--></script>