How To Restrict Already Opened url Using JS

you can refer this one and can get idea

http://stackoverflow.com/questions/4638910/javascript-check-for-duplicate-opened-window

You cannot control this directly at browser level.

You have to maintain a session at server end for this particular 'url' and browser using some cookie. Then you can check if the url request is coming using the same cookie id or from different cookie. Then further you can restrict the access to url if one session is already active at client end.