Servlet Session Information

Where exactly does the Servlet store the HttpSession information when I
create a session object?  I believe it is on the server side and mapped to
with the session ID of the client (but please correct me if I am wrong).  So
where exactly would that be on the server?  I also believe that it is
dependant on what application server I am using, since it is part of the
Servlet API...

I did some looking to see what exactly changed when I executed the following
code in a simple doGet method, and I seem to be unable to find it.

HttpSession httpSession = httpRequest.getSession(true);
httpSession.putValue("Productnumber", "Product1");

Just curious...
---Bob

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