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diff --git a/src/libs/engine/Responder.hpp b/src/libs/engine/Responder.hpp
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+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Ingen 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.
+ * 
+ * Ingen 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RESPONDER_H
+#define RESPONDER_H
+
+#include <inttypes.h>
+#include <string>
+#include <raul/SharedPtr.hpp>
+#include "interface/ClientInterface.hpp"
+
+namespace Ingen {
+
+
+/** Class to handle responding to clients.
+ *
+ * This is a glorified std::pair<ClientInterface*, int32_t> for replying
+ * to numbered messages from a client.
+ *
+ * For responses that involve more messages, the response will come first
+ * followed by the messages (eg object notifications, values, errors, etc.)
+ * in a bundle (or "transfer" if too large).
+ */
+class Responder
+{
+public:
+	Responder(Shared::ClientInterface* client=0, int32_t id=1)
+		: _client(client)
+		, _id(id)
+	{}
+
+	int32_t id() const { return _id; }
+	void    set_id(int32_t id) { _id = id; }
+
+	Shared::ClientInterface* client() const { return _client; }
+	void set_client(Shared::ClientInterface* client) { _client = client; }
+
+	void respond_ok() {
+		if (_client)
+			_client->response_ok(_id);
+	}
+
+	void respond_error(const std::string& msg) {
+		if (_client)
+			_client->response_error(_id, msg);
+	}
+
+private:
+	Shared::ClientInterface* _client;
+	int32_t                  _id;
+};
+
+
+} // namespace Ingen
+
+#endif // RESPONDER_H
+