Multi Browser request for same session

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ASP.NET

Hi I would like to know that "how do we manage multi browser request for same session at server for single user or multiple user".
suppose first time i access www.google.com from one browser,second time the same req from different browser so this time how server recognize that ,this is the same req for www.google.com.
can we do it using session or is there any other way to do this.
Please revert me on this.
Thanks to all