anchor.diff:  			:verf verf
   			:request-id request-id
   			:timeout timeout)))
  +    ;; verify the response 
       (when client 
         (verify client verf)
         (setf (rpc-client-initial client) nil))
  +    ;; return the result 
       res))
   
   ;; FIXME: it would be nice to have some simple way of providing default values for
  
positive.code:   (:documentation "The verifier to use for the client request."))
  
  (defgeneric verify (client verf)
    (:documentation "Verify the response received from the server."))
  
  
  ;; default methods for auth-null flavour authentication 
  
negative.code:     (unless (des-valid-server-verifier (des-client-key client)
  				       (des-client-timestamp client)
  				       v)
        (error 'rpc-error :description "Invalid DES verifier"))))
  
  ;; ----------------- gss ---------------
  
  