ImplicitScheduler is a read-only Boolean property that indicates if the Scheduler was created as a result of the server becoming Active. 

ImplicitScheduler will contain True when an object instance is assigned to Scheduler during activation of the the server (setting Active to True). ImplicitScheduler will contain False when Scheduler has been explicitly assigned in the application. 

ImplicitScheduler is also used when the server becomes inactive (the Active property is set to False). When ImplicitScheduler contains True, resources allocated to the Scheduler property at run-time will be freed during server shut down.

Scheduler 

Active