How do I prevent a user from opening multiple instances on the same computer?

On the site oldnavyweekly.com there is a .swf that prevents users from opening multiple instances of the site at the same time on the same computer. If you open the site, and try to open it a second time in another window, it won't load. You can't open the site again until the first window is closed. How did they implement this?
From my analysis it is NOT:
1. Cookies - The block still takes place if you try opening it in IE and also try opening it in Firefox simultaneously.
2. Flash Cookies - The block still takes place if I disable flash cookies.
3. IP Based Block - You are not blocked if you open the site on two separate computers with the same outbound IP address. From my analysis, their server does not assist in the block at all.
It seems as if their .swf is creating some kind of global system-wide object that can be detected in other instances of the application on the same machine. How did they implement this?
Thanks!

you're welcome.
actually, unless you take an extra step, the first opened swf will close. if you want the 2nd to close, the initial receiving lc will send a message to sender that causes the sender to close.

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Attachments:
popupVI.zip ‏37 KB

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