diff --git a/rfb_win32/WMNotifier.h b/rfb_win32/WMNotifier.h
new file mode 100644
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+++ b/rfb_win32/WMNotifier.h
@@ -0,0 +1,68 @@
+/* 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.
+ */
+
+// -=- WMNotifier.h
+//
+// The WMNotifier is used to get callbacks indicating changes in the state
+// of the system, for instance in the size/format/palette of the display.
+// The WMNotifier contains a Win32 window, which receives notifications of
+// system events and stores them.  Whenever processEvent is called, any
+// incoming events are processed and the appropriate notifier called.
+
+#ifndef __RFB_WIN32_NOTIFIER_H__
+#define __RFB_WIN32_NOTIFIER_H__
+
+#include <rfb/SDesktop.h>
+#include <rfb/Threading.h>
+#include <rfb_win32/MsgWindow.h>
+#include <rfb_win32/DeviceFrameBuffer.h>
+#include <rfb_win32/SInput.h>
+
+namespace rfb {
+
+  namespace win32 {
+
+    // -=- Window Message Monitor implementation
+
+    class WMMonitor : MsgWindow {
+    public:
+
+      class Notifier {
+      public:
+        typedef enum {DisplaySizeChanged, DisplayColourMapChanged,
+          DisplayPixelFormatChanged} DisplayEventType;
+        virtual void notifyDisplayEvent(DisplayEventType evt) = 0;
+      };
+
+      WMMonitor();
+      virtual ~WMMonitor();
+
+      void setNotifier(Notifier* wmn) {notifier=wmn;}
+
+    protected:
+      // - Internal MsgWindow callback
+      virtual LRESULT processMessage(UINT msg, WPARAM wParam, LPARAM lParam);
+
+      Notifier* notifier;
+    };
+
+  };
+
+};
+
+#endif // __RFB_WIN32_WMNOTIFIER_H__