The OPSMAIN address space has the following characteristics:
It is the central address space for CA OPS/MVS.
It is non-swappable.
It is a formal z/OS subsystem. That is, it puts an SSCT (subsystem control table) on the z/OS SSCT chain. This permits it to take advantage of the system exit points provided by z/OS.
With a few important exceptions, it must be running for the CA OPS/MVS facilities to be operative.