Installations can use the installation variable output data section to define their own keywords, or override one or more of the keyword values returned by the called subsystem in the system variable output section. The installation variable output data section has the same format as the system variable output data section. For more details see Format of the Variable Output Sections.

Installations can specify their own keyword values to be returned in the installation variable output section (through JES2 Exit 24 or JES3 via IATUX63). For more information about using JES2 Exit 24, see z/OS JES2 Installation Exits. For more information about using JES3 IATUX63, see z/OS JES3 Customization.