diff --git a/wm_hooks/wm_hooks.h b/wm_hooks/wm_hooks.h
new file mode 100644
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+++ b/wm_hooks/wm_hooks.h
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+/* Copyright (C) 2002-2003 RealVNC Ltd.  All Rights Reserved.
+ *    
+ * This 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 software 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 software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+// -=- wm_hooks.h
+//
+// Window Message Hooks Dynamic Link library
+//
+// This interface is used by the WMHooks class in rfb_win32 to hook the
+// windows on the desktop and receive notifications of changes in their
+// state.
+
+#ifndef __WM_HOOKS_H__
+#define __WM_HOOKS_H__
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#define DLLEXPORT __declspec(dllexport)
+
+extern "C"
+{
+  //
+  // -=- Display hook message types
+  //
+
+  DLLEXPORT UINT WM_Hooks_WindowChanged();
+  DLLEXPORT UINT WM_Hooks_WindowBorderChanged();
+  DLLEXPORT UINT WM_Hooks_WindowClientAreaChanged();
+  DLLEXPORT UINT WM_Hooks_RectangleChanged();
+  DLLEXPORT UINT WM_Hooks_CursorChanged();
+
+  //
+  // -=- Display update hooks
+  //
+
+  // - WM_Hooks_Install
+  // Add the current thread to the list of threads that will receive
+  // notifications of changes to the display.
+  // If thread is NULL then the entire display will be hooked.
+  // If thread is !NULL and then the specified
+  // thread will be hooked.
+  // Each thread may only register one hook at a time.
+  // The call will fail (return FALSE) if the thread already has hooks
+  // set, or if the hooks cannot be set, or some other error occurs.
+
+  DLLEXPORT BOOL WM_Hooks_Install(DWORD owner, DWORD thread);
+
+  // - WM_Hooks_Remove
+  // Removes any hook set by the current thread.
+  // The return indicates whether anything went wrong removing the hooks,
+  // that might cause problems later.
+
+  DLLEXPORT BOOL WM_Hooks_Remove(DWORD owner);
+
+  //
+  // -=- User input hooks
+  //
+
+  // - WM_Hooks_EnableRealInputs
+  // If TRUE is passed, then "real" input is enabled, otherwise it is disabled.
+
+  DLLEXPORT BOOL WM_Hooks_EnableRealInputs(BOOL pointer, BOOL keyboard);
+
+  // - WM_Hooks_EnableSynthInputs
+  // If TRUE is passed, then synthetic inputs are enabled, otherwise disabled.
+
+  DLLEXPORT BOOL WM_Hooks_EnableSynthInputs(BOOL pointer, BOOL keyboard);
+
+  //
+  // -=- Cursor shape hooking
+  //
+
+  // - WM_Hooks_EnableCursorShape
+  // If TRUE is passed, then hooks will produce notifications when cursor shape
+  // changes.
+
+  DLLEXPORT BOOL WM_Hooks_EnableCursorShape(BOOL enable);
+
+#ifdef _DEBUG
+  // - WM_Hooks_SetDiagnosticRange
+  // Select a range of messages that will be reported while hooks are active
+  DLLEXPORT void WM_Hooks_SetDiagnosticRange(UINT min, UINT max);
+  DLLEXPORT UINT WM_Hooks_Diagnostic();
+#endif
+
+}
+
+#endif // __WM_HOOKS_H__