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Dev@Force.ax647Dev@Force.ax647 

Userinfo.getSessionId() is same in all browsers for site guest user

I want to know if site guest user copy pasted or closed browser and reopened url from history. or opened same url in IE,FF, and chrome. To find out I used Userinfo.getSessionId() hoping that it will return different id in different browsers but after experiment I found it is returning same value in all browsers.

 

Any idea how I can get a unique session id? Also why it is returning same value?