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        Wraps the Accessibility.Registry to provide more Pythonic registration for
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        enforced. You can construct another instance of this object and give it a
        reference to the Accessibility.Registry singleton. Doing so is harmless and
        has no point.

        @@ivar async: Should event dispatch to local listeners be decoupled from event
                receiving from the registry?
        @@type async: boolean
        @@ivar reg: Reference to the real, wrapped registry object
        @@type reg: Accessibility.Registry
        @@ivar dev: Reference to the device controller
        @@type dev: Accessibility.DeviceEventController
        @@ivar clients: Map of event names to client listeners
        @@type clients: dictionary
        @@ivar observers: Map of event names to AT-SPI L{_Observer} objects
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                @@param main_loop_type: 'GLib', 'None' or 'Qt'. If 'None' is selected then caching
                                       is disabled.

                @@param use_registry: Whether to connect to a registry daemon for device events.
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                and 'object:property-change:accessible-parent' will register only for the
                parent property change event.

                Registered clients will not be automatically removed when the client dies.
                To ensure the client is properly garbage collected, call 
                L{deregisterEventListener}.

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                L{registerEventListener} is properly garbage collected.

                @@param client: Client callback to remove
                @@type client: callable
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                @@type key_set: list of integer
                @@param mask: When the mask is None, the codes in the key_set will be 
                        monitored only when no modifier is held. When the mask is an 
                        integer, keys in the key_set will be monitored only when the modifiers in
                        the mask are held. When the mask is an iterable over more than one 
                        integer, keys in the key_set will be monitored when any of the modifier
                        combinations in the set are held.
                @@type mask: integer, iterable, None
                @@param kind: Kind of events to watch, KEY_PRESSED_EVENT or 
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                @@type kind: list
                @@param synchronous: Should the callback notification be synchronous, giving
                        the client the chance to consume the event?
                @@type synchronous: boolean
                @@param preemptive: Should the callback be allowed to preempt / consume the
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                @@type key_set: list of integer
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                        monitored only when no modifier is held. When the mask is an 
                        integer, keys in the key_set will be monitored only when the modifiers in
                        the mask are held. When the mask is an iterable over more than one 
                        integer, keys in the key_set will be monitored when any of the modifier
                        combinations in the set are held.
                @@type mask: integer, iterable, None
                @@param kind: Kind of events to stop watching, KEY_PRESSED_EVENT or 
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                @@raise KeyError: When the client isn't already registered for events
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                @@param keycode: Hardware keycode or None
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                double-click).

                @@param x: Horizontal coordinate, usually left-hand oriented
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