# File lib/cgi/session.rb, line 457
      def initialize(session, option=nil)
        @session_id = session.session_id
        unless GLOBAL_HASH_TABLE.key?(@session_id)
          unless session.new_session
            raise CGI::Session::NoSession, "uninitialized session"
          end
          GLOBAL_HASH_TABLE[@session_id] = {}
        end
      end