Possible to detect if a user has multiple tabs of your site open?

Question

I\'m just thinking about the whole site registration process.

A user goes to your site, signs up, and then you tell him you\'ve sent him an email and he needs to ve

Answer 1

You can stop the page functionality when user opened another tab or another window or even another browser

$(window).blur(function(){
    // code to stop functioning or close the page  
});

Answer 2

The user will still have a session at the server. Why not store the user's location prior to registration, and when they confirm their registration, read the location back out of the session and redirect back to that page. No tab magic required. It's certainly not what I'd expect from a signup process.