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diff --git a/include/eda_dde.h b/include/eda_dde.h
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+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2007-2014 Jean-Pierre Charras, jp.charras at wanadoo.fr
+ * Copyright (C) 1992-2014 KiCad Developers, see CHANGELOG.TXT for contributors.
+ *
+ * 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, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file eda_dde.h
+ * @brief DDE server & client.
+ */
+
+#ifndef EDA_DDE_H_
+#define EDA_DDE_H_
+
+#include <wx/socket.h>
+
+
+// TCP/IP ports used by Pcbnew and Eeschema respectively.
+
+///< Pcbnew listens on this port for commands from Eeschema
+#define KICAD_PCB_PORT_SERVICE_NUMBER   4242
+
+///< Eeschema listens on this port for commands from Pcbnew
+#define KICAD_SCH_PORT_SERVICE_NUMBER   4243
+
+
+#define MSG_TO_PCB                      KICAD_PCB_PORT_SERVICE_NUMBER
+#define MSG_TO_SCH                      KICAD_SCH_PORT_SERVICE_NUMBER
+
+wxSocketServer* CreateServer( wxWindow * window, int port, bool local = true );
+bool SendCommand( int port, const char* cmdline );
+
+#endif    // EDA_DDE_H_