7.1.2 Explicit API

An IMS application program can use the explicit API to issue the CPI-C calls directly. The explicit API is useful with remote LU 6.2 systems that have incomplete LU 6.2 implementations, or that are incompatible with the IMS implicit API support.

The explicit API can be used by any IMS application program to access an APPC conversation directly. IMS resources are available to the CPI-C driven application program only if the application issues the APSB (Allocate_ PSB) call. The CPI-C driven application program must use the CPI-RR SRRCMIT and SRRBACK verbs to initiate an IMS sync point or backout.