The APPCPMxx parmlib member contains a combination of statement types that define or modify the APPC/MVS configuration. These statements define APPC/MVS local LUs, indicate whether they are associated with a transaction scheduler, and name their associated administrative VSAM files. For more information about using APPC, see z/OS MVS Planning: APPC/MVS Management .
An installation can control its APPC/MVS configuration with different versions of the APPCPMxx parmlib member. One member might contain startup values while other members contain customized values.
To initialize the APPC address space and set up the APPC/MVS configuration, specify APPCPMxx with a START APPC command. To modify the APPC/MVS configuration after initialization, specify APPCPMxx with the SET APPC operator command, or use the SETAPPC command to modify the configuration without using parmlib. See z/OS MVS System Commands for further information regarding the usage of this command.
You can specify more than one APPCPMxx parmlib member on a START or a SET APPC command. If you specify more than one member on the START or SET command, APPC processes the statements in the order specified and creates a cumulative configuration. If you specify one or more members that do not exist, APPC/MVS issues an informational message. For more information about the START and SET commands, see z/OS MVS System Commands.
If you do not specify a parmlib member with the START command, the system searches for an APPCPM00 member, by default. If APPCPM00 does not exist, APPC/MVS issues an informational message.