11.2. CICS messages
CICS messages consist of the prefix DFH followed by a two-letter component identifier (cc), and a four-digit message number (nnnn). The component identifier shows the domain or the component which issues the message. Some examples of the component identifier are:
AP - The application domain
DS - The dispatcher domain
SM - The storage manager domain
XM - The transaction manager
XS - The CICS security component
Thus, the CICS message DFHAP0002 is issued from the application domain, identified by the two-character identifier AP.
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