At the top level, CICS® is organized into domains. With the exception of the application domain, which contains several components, each domain is a single major component of CICS. Domains never communicate directly with each other. Calls between domains are routed through kernel linkage routines. Calls can be made only to official interfaces to the domains, and they must use the correct protocols. This structure is shown in Figure 1.
Each domain manages its own data. No domain accesses another domain’s data directly. If a domain needs data belonging to another domain, it must call that domain, and that domain then passes the data back in the caller’s parameter area.
The following table lists the CICS domains alphabetically by domain identifier. For each domain, the table also shows whether or not the domain is OCO, and gives a topic reference to the topic describing the interfaces to the domain.
The offline statistics utility program (DFHSTUP) and the system dump formatting routines are also treated as OCO.
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