Defining CICS to CA Top Secret › Facilities Matrix › Defining the CICS SIT DFLTUSER ACID

Defining the CICS SIT DFLTUSER ACID

CICS uses the SIT DFLTUSER during region start‑up, during session initiation, and during signon processing. During region start‑up, CICS signs the DFLTUSER on without an associated terminal. The non‑terminal CICS ACEE generated by this signon is then used for processing transactions for which a signon cannot be inferred.

This can include:

• Transactions initiated from PLT
• Transactions started from sessions where no signon has yet occurred
• Transactions initiated from DCT trigger without assigned user

The characteristics of this “default user” session cannot change throughout the life of the CICS region because the non‑terminal session is only signed on at region start‑up.