The MVS™ command prefix facility (CPF) allows a subsystem (like JES2 or DB2®) to create unique command prefixes for each copy of the subsystem in the sysplex and control which systems can accept the subsystem commands for processing. For example, using the JES2 CONDEF initialization statement, an installation can define a JES2 command prefix with sysplex scope. No matter which system an operator uses to enter the JES2 command, MVS can recognize the prefix and direct the command to the system where the prefix has been defined.

For information on the JES2 initialization statement that uses the command prefix facility, see z/OS JES2 Initialization and Tuning Reference. For information on the CPF macro that other subsystems or application programs can use to issue commands in a sysplex, see z/OS MVS Programming: Authorized Assembler Services Guide.