Advanced Program-to-Program Communication (APPC) is started with the APPC logging option indicated. This message is issued to hardcopy only.

APPC uses a System Logger log stream whenever a synchronization level of SYNCPT is selected by a transaction program, and when an LU has been made syncpt-capable. This log stream is used to store persistent data needed in support of the two-phase commit protocol.

An installation can choose to have the log stream name contain the RRS GNAME (RRS logging group) as one of the log stream name qualifiers. This allows installations to have more than one APPC log stream in the same sysplex. To select this option, the installation would define a value of RRSGNAME on the LOGGING subparameter of the PARM parameter of the EXEC statement in the APPC member of SYS1.PROCLIB. See z/OS MVS Programming: Resource Recovery for more information concerning the RRS GNAME parameter.

If an installation chooses to have just one APPC log stream in the sysplex, it can specify a value of LEGACY on the LOGGING subparameter or it can omit the LOGGING subparameter entirely.