Click one or more buttons on the list
in the Options area (Initial, Repeat, and Return).
Asynchronous monitors are event-driven, not polled. They generate messages
as events occur. Therefore if the resource is an asynchronous monitor,
the values in the Options area defaults to Repeat and cannot be changed.
The Options area will not be displayed if you have selected When value changes or At each interval from the list in the Notify area. In these cases, the option default to Initial cannot be changed.