title: "Listening" for changes in cookie in all opened tabs
body: <p>So, I have this cookie that affect my login state in an app. When I erase it the user will logout, in login it will be created (all happens in server side, and is sent to me). Simple enough.</p>
  
  <p>Question is - Is there any way to affect the user in tab A, if he got another tab B which is a duplicate of A? </p>
  
  <p>e.g. The user login in tab A, duplicate the tab to tab B, logs out from there then returns to tab A - and he logged out there as well. </p>
  
  <p>Just to be clear - I'm asking if this is possible browser-wise in JavaScript.</p>