The 
GUIInitializedListener interface is used by the 
EventQueueMonitor
 class to notify an interested party when the GUI subsystem has been
 initialized.  This is necessary because assistive technologies can
 be loaded before the GUI subsystem is initialized.  As a result,
 assistive technologies should check the
 
isGUIInitialized method
 of 
EventQueueMonitor before creating any GUI components.  If the
 return value is true, assistive technologies can create GUI components
 following the same thread restrictions as any other application.  If
 the return value is false, the assistive technology should register
 a 
GUIInitializedListener with the 
EventQueueMonitor to be notified
 when the GUI subsystem is initialized.