lispdoc - results for abort 

(abort &optional condition)
Function: Transfer control to a restart named ABORT, signalling a CONTROL-ERROR if none exists.
Example:
(defun error-popup (message title icon)
  (ecase
      (message-box message title
       (if (find-restart 'continue)
           "yesno"
           "ok")
       icon)
    (:yes (continue))
    ((:ok :no) (abort))))
Mentioned in:
CLtL2 - 29.3.17. Condition Handlers
CLtL2 - 29.3.8. Restart Functions
CLtL2 - 29.4.10. Restart Functions
CLtL2 - 29.4.7. Establishing Restarts
HyperSpec - Function ABORT, CONTINUE, MUFFLE-WARNING, STORE-VALUE, USE-VALUE
HyperSpec - Restart ABORT
(hunchentoot:abort-request-handler &optional result)
Function: This function can be called by a request handler at any time to immediately abort handling the request. This works as if the handler had returned RESULT. See the source code of REDIRECT for an example.
  

By Bill Moorier