Control blocks

The main CICS® control block in the AP domain is the common system area (CSA), which exists from CICS system initialization time until CICS is closed down. The CSA contains:

The CSA has an extension area known as the CSA optional features list. The address of the optional features list is held in CSAOPFLA in the CSA, and also in TCACSOAD in the TCA.

See CICS Data Areas for a detailed description of these control blocks.

There is also a user-defined work area, called the common work area (CWA). The user can govern the length and storage key of the CWA by using the WRKAREA and CWAKEY system initialization parameters.

The CWA is available to any task while it has control of the system (that is, for operations performed between requests to CICS).

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