TAC queues are permanent, service-controlled message queues. Each TAC queue has a fixed name that is generated with the KDCDEF statement TAC ... TYPE=Q. TAC queues can be accessed by any service by means of a program call, provided it knows the name of the queue.
Remote message queues, for example, can be implemented with the help of TAC queues. These remote queues are addressed in the local application by means of the LTAC name (see also "Service-controlled queues in distributed processing").
TAC queues can also be used in job complexes. Both the basic job and the confirmation jobs can be directed at TAC queues.
Messages can also be sent to TAC queues with time control.
At generation, read and write protection can be assigned for the TAC queue in the KDCDEF statement (READ-ACL and WRITE-ACL parameters). By means of dynamic administration (STATUS attribute), TAC queues can be locked completely for read and/or write access.
For more information on the generation of TAC queues, refer to the section on the KDCDEF statement TAC in the openUTM manual “Generating Applications”.