You can use scheduling environments with the following parameters:

• The SYSAFF parameter or SYSTEM parameter on the JOB control statement.
• The SYSAFF parameter on the /*JOBPARM control statement for JES2.
• The SYSTEM parameter on the //*MAIN control statement for JES3.

For example, you can restrict a job to either SYS1 or SYS2 based on the scheduling environment associated with that work, and then use the SYSAFF or SYSTEM parameter to further restrict that work only to system SYS1.