Initialization of CICS for CICS function shipping

If CICS® has been generated with the appropriate options for intercommunication, the initialization of CICS with the ISC=YES system initialization parameter specified causes the following modules to be loaded:
  • DFHISP (intersystem communication program)
  • DFHXFP (data transformation program)
  • DFHXFX (optimized data transformation program)

The entry point addresses of these modules are contained in the optional features list, which is addressed by CSAOPFLA in the CSA.

The mirror program, DFHMIRS, is not loaded until a request is received from a remote system. DFHMIRS can only be loaded if its PROGRAM resource definition is installed, and TRANSACTION resource definitions are installed for the mirror transactions CSMI, CSM1, CSM2, CSM3, and CSM5 or the transactions CVMI and CPMI. All these resource definitions are in the group DFHISC, which is included in DFHLIST.

Note: The ISC=YES system initialization parameter causes other modules besides those specified earlier to be loaded; the ones mentioned here are those specifically required for CICS function shipping.