 class models Folder <em>existence</em> events. FolderEvents are
 delivered to FolderListeners registered on the affected Folder as
 well as the containing Store. <p>

 Service providers vary widely in their ability to notify clients of
 these events.  At a minimum, service providers must notify listeners
 registered on the same Store or Folder object on which the operation
 occurs.  Service providers may also notify listeners when changes
 are made through operations on other objects in the same virtual
 m