ECI V1
This section describes CICS_ExternalCall and the call types
that control its function.
EPI
This section describes the constants and data structures
that you need to use the EPI, the functions provided by the EPI that
can be called from an application program, and the EPI events that
occur when CICS has data to pass to the EPI application.
ESI V1
This section describes the constants and data structures
that you need to use the ESI, and the functions provided by the ESI
that can be called from an application program.