Support for CICS Channels and Containers

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# Support for CICS Channels and Containers

The IBM CICS Transaction Server for z/OS supports channels and containers for `EXEC CICS LINK`. In this respect CICS containers can be considered as named COMMAREAs without the 32 KB limit.

Natural CICS Interface supports CICS containers in two ways:

1. Via a special `SET CONTROL``'P=CC'`, the `CALL` statement parameter data is passed in a container.

2. When the `NTCICSP` macro parameter `CNTCALL` is set to `ON`, a `%P=C` `CALL` automatically uses a CICS container rather than a CICS COMMAREA, when the parameter data passed with the `CALL` statement exceeds 32 KB.

In both cases, the default container name is `NCI-COMMAREA` unless a container name is defined explicitly via application programming interface `USR4204N` prior to the "real" `CALL` statement.