z/OS® Explorer is not SYSPLEX aware, and therefore requires that user-specific components that are started as JCL and are active on the same system the z/OS Explorer client is connected to.

In z/OS 2.1, you can specify SYSAFF=* or SYSTEM=* on the JOB card to enforce that the job runs on the system it was submitted. On older systems you must explicitly specify the correct system name when using a JESPLEX to unite multiple JES subsystems in a SYSPLEX.