With this interface applications are able to receive events from the system and from other applications.
EventManager class is the starting point
in the events package. It provides methods to query system states, register
listeners to be notified on events, and to register the application to be
launched on events. The events are delivered through
EventListener interface that the
applications implement. The event notifications encapsulate the information
about the event into the
Event class defines the names of system events. Access to
events is controlled by the
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