This chapter contains detailed information on the directed function codes that your program can request. IBM® subsystems provide these function codes.* The following table lists each supported SSI function code, its function, the subsystems that support the function and the type of subsystem request.

Function Code	Requested Function	Subsystem*	Type of Request
1	Process SYSOUT data sets	JES2/JES3	Directed
11	User Destination Validation/Conversion	JES2/JES3	Directed
15	Verify subsystem function	Master	Directed
20	Request job ID	JES2/JES3	Directed
21	Return job ID	JES2/JES3	Directed
54	Request subsystem version information	JES2/JES3/Master	Directed
70	Scheduler Facilities services	JES2/JES3	Directed
71	JES JOB information	JES2	Directed
75	Notify user message service	JES2/JES3	Directed
79	SYSOUT Application Program Interface (SAPI)	JES2/JES3	Directed
80	Extended Status Function Call	JES2/JES3	Directed, Broadcast
82	JES Properties	JES2/JES3	Directed
83	JES Device information services	JES2/JES3	Directed
85	Modify job	JES2	Directed

*Not all supported levels of the IBM subsystems support all the function codes available with the current release of z/OS®.

Your program need not be a subsystem to use these function codes. In addition to the SSI function codes provided by the operating system, installations can also define and use their own function codes, using the range 236 to 255. You can design your own directed requests for these function codes.