Say you have your main page, which is just a frameset. All the navigation occurs within that frameset, such that going from page1 to page2 merely updates the frame's url, it doesn't re-create the host page. This leaves the host page intact, including it's JavaScript state. Therefore, you could have a JavaScript variable persist data between pages.
<html>
<head>
<title>My App</title>
<script language="javascript" type="text/javascript">
var _javaScriptVar = null;
</script>
</head>
<frameset>
<frame src="Page1.aspx" id="mainFrame">
</frameset>
</html>
You could then reference this variable from your child pages via the DOM:
window.parent._javaScriptVar = "someValue";
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