Limit client to visit a website with 1 tab and 1 browser? [closed]

Question

I would like to do something like play.clubpenguin.com.

What it does is that, when you visit the site, maybe using firefox or IE, if you opened a new tab or use other browser, when you visit that site again, it will show something like: "Please close the other browser that opened this page" or something like that.

How to do this? (Its client's request)

More information: The site is Flash site

EDIT:

Ok, i think this is a tough question, well, in general, Can this be done using php, mysql and JS?

Answer 1

Each time you serve the flash page to the user, generate a random token. Embed this token somewhere in the page, for example as a flashVar. Also, store the most recently generated token in the user's session.

Whenever the flash posts something back to the server, post the token as well. If the token does not match the token stored in the session, reject the post.

That way, only the most recently generated version of the page will have the ability to communicate with the server and if the user opens multiple versions of the page only the most recent will work.

This technique should work even if the user opens extra browsers on other machines. It doesn't use IP addresses to establish identity. And there is no chance that a user will somehow be 'locked out' permanently because every time they open the page again you reset the stored token.

It's a similar idea to the way some frameworks insert a validation token into forms to prevent Cross-site Request Forgery attacks.

Answer 2

try using the below code:

    window.onload = function(){
    if (document.cookie.indexOf("_instance=true") === -1) {
    document.cookie = "_instance=true";
    // Set the onunload function
    window.onunload = function(){
        document.cookie ="_instance=true;expires=Thu, 01-Jan-1970 00:00:01 GMT";
    };
    // Load the application
    }
    else {
    // Notify the user
    }
    };

The code will restrict the user to open one browser tab at a time and during browser refresh(current tab) the code will not show any alert. Copy pasting the same URL in new tab will not be allowed the user to open. for more info try this