question in user state management using Session

[suhas]

Hi I want to know the http request header key  -   I'm writing request.getSession(true)  in the jsp .  This method in turn might be settting the browser header key .( dunno exactly name of that key)  .But I think that header key is "set-cookie = 12313 " ( this can be the unique  session id that server has to set for identifying a user) . So whenever server receives this key in the http request , server identifies the user , if the key is present in the request    Server checks the hashtable stored in the server  and retrieves the  information for that   In another jsp page I tried to print all the request header keys , But there wasn't any such key found . ?   Can u tell how to check for that key