Application domain

Application programs are run in the application (AP) domain, which contains several major components, as shown in Figure 2.

Most application domain CICS® functions are either provided by modules that are part of the CICS nucleus, that is to say they are an integral part of the system and are loaded at system initialization time, or they are system application programs, which are loaded as needed in the same way as user application programs.

Figure 2. AP domain--major components
 The application (AP) domain contains the following components: Application services -- basic mapping support, built-in functions, command interpreter, data interchange program, execution diagnostic facility. Extended recovery facility. Intercommunication facilities -- distributed transaction processing, function shipping, interregion communication, transaction routing, recovery manager connectors, VTAM LU6.1, VTAM LU6.2. System control -- AP domain initialization and termination, DL/I and DBCTL support, EXEC interface program, file control, interval control, resource recovery manager, storage compatibility, syncpoint program, table manager, task-related user exit control, temporary storage control, terminal control, trace compatibility, transient data control, user exit control. System reliability -- abnormal condition program, dynamic backout, emergency restart, keypoint programs, node abnormal condition program, node error program, program error program, retry program, system recovery program, task-related user exit recovery, terminal abnormal condition program, terminal error program. System services -- dynamic allocation, field engineering program, Good Morning message program, master terminal program, message switching, operator terminal, resource definition, signon and signoff, system spooling interface, time-of-day control.
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