This isolates CICS® from all the non-CICS work involved in communicating to the IBM® Connect:Direct® DTF through the IBM Connect:Direct API. A CICS Interface monitor transaction is also invoked as part of interface startup to support and monitor interface operation.
The CST in turn attaches other subtasks, called WSTs (worker subtasks), organized by node. The WSTs establish and manage the DTF sessions, passing IBM Connect:Direct commands, and receiving returned information. The CST controls traffic between all CICS Interface transactions and each WST.