diff --git a/common/rfb/VNCServer.h b/common/rfb/VNCServer.h
new file mode 100644
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+++ b/common/rfb/VNCServer.h
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+/* Copyright (C) 2002-2005 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.
+ */
+//
+// VNCServer - abstract interface implemented by the RFB library.  The back-end
+// code calls the relevant methods as appropriate.
+
+#ifndef __RFB_VNCSERVER_H__
+#define __RFB_VNCSERVER_H__
+
+#include <rfb/UpdateTracker.h>
+#include <rfb/SSecurity.h>
+
+namespace rfb {
+
+  class VNCServer : public UpdateTracker {
+  public:
+
+    // setPixelBuffer() tells the server to use the given pixel buffer.  If
+    // this differs in size from the previous pixel buffer, this may result in
+    // protocol messages being sent, or clients being disconnected.
+    virtual void setPixelBuffer(PixelBuffer* pb) = 0;
+
+    // setColourMapEntries() tells the server that some entries in the colour
+    // map have changed.  The server will retrieve them via the PixelBuffer's
+    // ColourMap object.  This may result in protocol messages being sent.
+    // If nColours is 0, this means the rest of the colour map.
+    virtual void setColourMapEntries(int firstColour=0, int nColours=0) = 0;
+
+    // serverCutText() tells the server that the cut text has changed.  This
+    // will normally be sent to all clients.
+    virtual void serverCutText(const char* str, int len) = 0;
+
+    // bell() tells the server that it should make all clients make a bell sound.
+    virtual void bell() = 0;
+
+    // clientsReadyForUpdate() returns true if there is at least one client
+    // waiting for an update, false if no clients are ready.
+    virtual bool clientsReadyForUpdate() = 0;
+
+    // - Close all currently-connected clients, by calling
+    //   their close() method with the supplied reason.
+    virtual void closeClients(const char* reason) = 0;
+
+    // tryUpdate() causes the server to attempt to send updates to any waiting
+    // clients.
+    virtual void tryUpdate() = 0;
+
+    // setCursor() tells the server that the cursor has changed.  The
+    // cursorData argument contains width*height pixel values in the pixel
+    // buffer's format.  The mask argument is a bitmask with a 1-bit meaning
+    // the corresponding pixel in cursorData is valid.  The mask consists of
+    // left-to-right, top-to-bottom scanlines, where each scanline is padded to
+    // a whole number of bytes [(width+7)/8].  Within each byte the most
+    // significant bit represents the leftmost pixel, and the bytes are simply
+    // in left-to-right order.  The server takes its own copy of the data in
+    // cursorData and mask.
+    virtual void setCursor(int width, int height, const Point& hotspot,
+                           void* cursorData, void* mask) = 0;
+
+    // setCursorPos() tells the server the current position of the cursor.
+    virtual void setCursorPos(const Point& p) = 0;
+
+    // setSSecurityFactory() tells the server which factory to use when
+    // attempting to authenticate connections.
+    virtual void setSSecurityFactory(SSecurityFactory* f) = 0;
+
+    // setName() tells the server what desktop title to supply to clients
+    virtual void setName(const char* name) = 0;
+  };
+}
+#endif