Controlling SMS Support (ON SMS Rules)

The SMS interface is shared among all Control‑O installations in the site and therefore is version-independent. The first Control‑O subsystem to initialize loads the SMS interface module to common storage that is later used by all other Control‑O subsystems. Every subsystem, upon startup, registers itself with the SMS interface. This registration mechanism allows the SMS interface to recognize all available Control‑O subsystems and to call them when one of the provided ACS exit routines is driven.

When a Control‑O subsystem shuts down, it removes itself from the SMS interface. The last Control‑O subsystem to shut down also removes the SMS interface completely from common storage.

Either of the following message sequences indicates a successful installation of the SMS interface:

• for the first Control‑O subsystem to initialize

• for any subsequent Control‑O subsystem that initializes

Either one of the following message sequences indicates a successful deactivation of the SMS interface:

• for any Control‑O subsystem to shut down, except for the last in the system

• for the last Control‑O subsystem that shuts down