NAME contains the name of the required action (or task within a monolith) and VALUE is a string specifying parameter values in a format acceptable to the parameter system.
For OBEY the action must not be active and for CANCEL the action must be active; otherwise the transaction is terminated (in DTASK_COMSHUT()) by calling AMS_REPLY() with a suitable bad message status.
If the OBEY/CANCEL is valid, SUBPAR_FINDACT() is called to set up the parameter system for the specified action and the VALUE string is processed (SUBPAR_CMDLINE()) to set the value of any given parameters.
ADAM The Control Subsystem