How to prevent a user from having multiple instances of the Same Web application

Question

I\'m wondering if it is possible to determine if a user already has a web browser open to the web application I\'m working on. It seems that they can open several instances

Answer 1

You can do this by window.name. In java script window.name has blank value on each new tab. Set window.name value on login page and save in session.

window.name = Math.random() + "_YourApplication"

Now check this window.name on master page/Layout page. Log out user if it contain multiple tab.

 if (!window.name || window.name != '@Session["WindowName"]') {
    //Log Off code
 }