Terminal operator and devices

7

If the VTAM® application program communicates with a cluster controller program rather than with a non-programmable terminal, the VTAM application program might not need to know about the terminal operator or device actions. The LU (implemented by the cluster controller program) determines whether and how data received from a terminal operator or device goes to the VTAM application program and whether and how data received from the VTAM application program goes to the terminal operator or device.

A VTAM application program can also communicate with a batch-transmission or batch-reception program in a cluster controller (such as the 3791 batch function). The VTAM application program does not need to know the original source of, or the eventual disposition of, data received from or sent to the subsystem batch program.