Retrieves the appropriate interface for events.
watcher = object.GetWatcher(scope, mask)
scope Required. A FEEDS_EVENTS_SCOPE value that limits the extent of events notifications to be received. mask Required. A combination of FEEDS_EVENTS_MASK values that specify the source of events.
Object that receives the event callback.
The mask parameter must be appropriate for the object. A watcher for folder events is available to folder objects only; requesting a folder events watcher from a feed object returns an error.