TCTUAKEY
The TCTUAKEY system initialization parameter specifies the storage key for the terminal control table user areas (TCTUAs) if you are operating CICS® with storage protection (STGPROT=YES).
- TCTUAKEY={USER|CICS}
- The permitted values are USER (the default), or CICS:
- USER
- CICS obtains the amount of storage for TCTUAs in user key. This allows a user program executing in any key to modify the TCTUA.
- CICS
- CICS obtains the amount of storage in CICS key. This means that only programs executing in CICS key can modify the TCTUA, and user-key programs have read-only access.
If CICS is running without storage protection, the TCTUAKEY parameter only designates which DSA (User or CICS) the storage comes from. The TCTUAs are accessed in CICS-key whether they are in the UDSA or CDSA.