Question about browser sessions

In a java web app, if I am browsing a site and then I open another IE 8 window* and go to the same site, is there a way to detect that the new request has come from another window from the same machine.

Basicall开发者_Python百科y my requirement is to alert the user that they cannot open another window with the same site.

*In IE 8 all windows share the same session. Hence request.getsession() would always return the same ID across all the windows.

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There is a great article about this exact question over at The Code Project. It's not 100% possible to detect this, but it is possible to work around it.