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diff --git a/engines/glk/archetype/sys_object.h b/engines/glk/archetype/sys_object.h
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+++ b/engines/glk/archetype/sys_object.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.
+ *
+ * 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 ARCHETYPE_SYS_OBJECT
+#define ARCHETYPE_SYS_OBJECT
+
+#include "glk/archetype/string.h"
+#include "glk/archetype/interpreter.h"
+
+namespace Glk {
+namespace Archetype {
+
+extern void sys_object_init();
+
+/**
+ * Is the receiver of all "system calls" and the only object that receives
+ * messages in the form of strings rather than message constants.
+ *
+ * Notes: Uses a global variable called sys_state to keep track of its state
+ * between calls.
+ */
+extern void send_to_system(int transport, String &strmsg, ResultType &result, ContextType &context);
+
+} // End of namespace Archetype
+} // End of namespace Glk
+
+#endif