# File lib/merb-core/dispatch/session.rb, line 115
      def self.included(base)
        base.extend ClassMethods
        
        # Keep track of all known session store types.
        base.cattr_accessor :registered_session_types
        base.registered_session_types = Dictionary.new
        base.class_inheritable_accessor :_session_id_key, :_session_secret_key,
                                        :_session_expiry
        
        base._session_id_key        = Merb::Config[:session_id_key] || '_session_id'
        base._session_expiry        = Merb::Config[:session_expiry] || 0
        base._session_secret_key    = Merb::Config[:session_secret_key]
      end