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diff --git a/engines/pegasus/interaction.h b/engines/pegasus/interaction.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef PEGASUS_INTERACTION_H
+#define PEGASUS_INTERACTION_H
+
+#include "pegasus/input.h"
+#include "pegasus/util.h"
+
+namespace Pegasus {
+
+static const InteractionID kNoInteractionID = -1;
+
+class Neighborhood;
+
+class GameInteraction : public IDObject, public InputHandler {
+public:
+	GameInteraction(const InteractionID id, Neighborhood *nextHandler) : IDObject(id), InputHandler((InputHandler *)nextHandler) {
+		_isInteracting = false;
+		_savedHandler = 0;
+		_owner = nextHandler;
+	}
+
+	// If the interaction is open (_isInteracting == true), it's too late to do anything
+	// about it here.
+	virtual ~GameInteraction() {}
+
+	// startInteraction and stopInteraction are called by the outside world to
+	// start and stop the interaction sequence.
+	// isInteracting returns a bool indicating whether or not the interaction
+	// is going.
+	void startInteraction() {
+		if (!isInteracting()) {
+			openInteraction();
+			initInteraction();
+			_isInteracting = true;
+			_savedHandler = InputHandler::setInputHandler(this);
+		}
+	}
+	void stopInteraction() {
+		if (isInteracting()) {
+			closeInteraction();
+			_isInteracting = false;
+			if (InputHandler::_inputHandler == this)
+				InputHandler::setInputHandler(_savedHandler);
+		}
+	}
+	void startOverInteraction() {
+		if (isInteracting())
+			resetInteraction();
+	}
+	bool isInteracting() const { return _isInteracting; }
+	Neighborhood *getOwner() const { return _owner; }
+
+	virtual Common::String getBriefingMovie() { return ""; }
+	virtual Common::String getEnvScanMovie() { return ""; }
+	virtual long getNumHints() { return 0; }
+	virtual Common::String getHintMovie(uint) { return ""; }
+	virtual bool canSolve() { return false; }
+
+	virtual void setSoundFXLevel(const uint16) {}
+	virtual void setAmbienceLevel(const uint16) {}
+
+	virtual void doSolve() {}
+
+protected:
+	// Subclasses override openInteraction and closeInteraction to perform
+	// specific initialization and cleanup. Override resetInteraction to
+	// "start the interaction over." resetInteraction is called only when
+	// the interaction is already open.
+	// These functions are only called in pairs, never two opens or closes
+	// in a row.
+	virtual void openInteraction() {}
+	virtual void initInteraction() {}
+	virtual void closeInteraction() {}
+	virtual void resetInteraction() {}
+
+	InputHandler *_savedHandler;
+	Neighborhood *_owner;
+
+private:
+	// Private so that only StartInteraction and StopInteraction can touch it.
+	bool _isInteracting;
+};
+
+} // End of namespace Pegasus
+
+#endif