Not allow user to open website in multiple windows

jQuery plugin to check if current window is duplicate window,

This plugin works across all browsers IE, Firefox, Microsoft Edge & Google chrome

It is checking GUID of the window against value in cookie

Sample usage:

 <script type="text/javascript"> $(document).ready(function () { if (window.IsDuplicate()) { alert("this is duplicate window\n\n closing..."); window.close(); } }); </script> 

demo