The IBM® DB2® external security module for RACF® initialization function for subsystem subsystem-name determined the version and length of the RACF/DB2 external security module for subsystem subsystem-name. If this is DB2 data sharing, subsystem-name is the group attach name. Otherwise, it is the DB2 subsystem. module-version is the FMID or APAR number associated with the module. module-length is the hexadecimal length of all CSECTs contained in the module.