This macro may not be used prior to the completion of WLM address
space initialization
Caller must have issued the IWM4MSTR macro successfully.
Caller is responsible for error recovery
The current PSW key must be 0 or match the key specified on IWM4MCRE
provided the latter is a system key (0-7).
The caller must serialize to prevent any delay monitoring services
from being invoked concurrently for the environment represented by
the monitoring token
This macro may only be used on z/OS V2R1 or higher.