Input/output via system files

System files are standardized input/output areas of the system to which particular terminals or files can be assigned. They are available to any task and require no prior declaration.
They include

• the logical input files of the operating system SYSDTA and SYSIPT

• the logical output files of the operating system
  SYSOUT, SYSLST, SYSLSTnn (nn = 01...99) and SYSOPT