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diff --git a/dnn/Trigger.h b/dnn/Trigger.h
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+/*
+ *	DNN - Data News Network
+ *
+ *	by Stephane Chatty
+ *
+ *	Copyright 1993-1994
+ *	Centre d'Etudes de la Navigation Aerienne (CENA)
+ *
+ *	Event triggers.
+ *
+ *	$Id$
+ *	$CurLog$
+ */
+
+#ifndef DnnTrigger_H_
+#define DnnTrigger_H_
+
+#include "cplus_bugs.h"
+#include "ccu/List.h"
+
+class DnnReaction;
+class DnnWindow;
+class DnnEvent;
+
+class DnnTrigger {
+friend	class	DnnBaseReaction;
+
+private:
+		DnnTrigger (const DnnTrigger&);
+	DnnTrigger&	operator = (const DnnTrigger&);
+
+protected:
+	CcuListOf <DnnBaseReaction>	Subscribers;
+	void	Subscribe (DnnBaseReaction&);
+	void	Unsubscribe (DnnBaseReaction&);
+
+public:
+		DnnTrigger ();
+		~DnnTrigger ();
+inline	const CcuListOf <DnnBaseReaction>&	GetSubscribers () const	{ return Subscribers; }
+	void	Dispatch (DnnEvent&);
+};
+
+#endif	/* DnnTrigger_H_ */