check if a website is opened in another window

[dolittle]

Hi,

Is it possible to use javascript to check if a website is opened in another tab or window?

I thought about setting a cookie that will expire in the end of the session.

The only problem is that if a user opens two browser windows A and B with the website opened at window A and then window A crashes, window B will still hold the cookie.

Any idea?

Thanks

[dmjpro]

I think it is not possible.
you can check that whether it has been opened somewhere but in which window it has been opened, can't be tracked.
in same domain the cookie with same name overlapped.