All AWT event sources support multicast model for listeners.
Multiple listeners can be added and removed from single source.
Notification of occurrence of same event can be sent to one or more listener objects.
According to Sun:
"API makes no guarantees about order in which events are delivered to set of registered listeners for given event on given source. ... If order in which events are delivered to listeners is factor for your program, you should chain listeners off single listener which is registered on source."
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