The default error handling routine, ERROR HANDLING, consists of a simple call to the function ERROR LOGGING, using the same parameters. In the event that the default error handling is insufficient, a substitute error handling function may be defined by the application program - with a call to the SET ERROR HANDLING function. The application must define the new error handling function with the same arguments as defined for ERROR HANDLING. The new error handling routine may include whatever code is necessary to handle any given error condition adequately, but it is recommended that a call to ERROR HANDLING be included as part of the application defined error handler.