Q767 How do I access a function in the popup windows opening window?

With:

<SCRIPT LANGUAGE="JavaScript"><!--
opener.functionName();
//--></SCRIPT>

Although you may need to define the opener property when opening the window:

<SCRIPT LANGUAGE="JavaScript"><!--
windowHandle = window.open(...)
if (!windowHandle.opener)
    windowHandle.opener = self;
//--></SCRIPT>

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