Communication between CA Datacom/DB MUF and an application program is usually handled in z/OS by a Program Call PC process and in z/VSE by a supervisor call (SVC) routine. You can also set z/OS to use a supervisor call (SVC) routine. These requests for CA Datacom/DB service go through the Multi-User Facility interface, which uses the CA Datacom/DB PC or SVC to pass each request to the Multi-User Facility and pass the results of the request back to the user. If an error occurs during the PC or SVC processing, an error code is displayed within message DB00205E, DB10051E, or DB13106I.
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