diff --git a/rfb_win32/CKeyboard.cxx b/rfb_win32/CKeyboard.cxx
new file mode 100644
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+++ b/rfb_win32/CKeyboard.cxx
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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.
+ */
+
+#include <map>
+
+#define XK_MISCELLANY
+#define XK_LATIN1
+#define XK_CURRENCY
+#include <rfb/keysymdef.h>
+
+#include <rfb_win32/CKeyboard.h>
+#include <rfb/CMsgWriter.h>
+#include <rfb/LogWriter.h>
+#include <rfb_win32/OSVersion.h>
+#include "keymap.h"
+
+using namespace rfb;
+
+static LogWriter vlog("CKeyboard");
+
+
+// Client-side RFB keyboard event sythesis
+
+class CKeymapper {
+
+public:
+  CKeymapper()
+  {
+    for (int i = 0; i < sizeof(keymap) / sizeof(keymap_t); i++) {
+      int extendedVkey = keymap[i].vk + (keymap[i].extended ? 256 : 0);
+      if (keysymMap.find(extendedVkey) == keysymMap.end()) {
+        keysymMap[extendedVkey] = keymap[i].keysym;
+      }
+    }
+  }
+
+  // lookup() tries to find a match for vkey with the extended flag.  We check
+  // first for an exact match including the extended flag, then try without the
+  // extended flag.
+  rdr::U32 lookup(int extendedVkey) {
+    if (keysymMap.find(extendedVkey) != keysymMap.end())
+      return keysymMap[extendedVkey];
+    if (keysymMap.find(extendedVkey ^ 256) != keysymMap.end())
+      return keysymMap[extendedVkey ^ 256];
+    return 0;
+  }
+
+private:
+  std::map<int,rdr::U32> keysymMap;
+} ckeymapper;
+
+
+class ModifierKeyReleaser {
+public:
+  ModifierKeyReleaser(CMsgWriter* writer_, int vkCode, bool extended)
+    : writer(writer_), extendedVkey(vkCode + (extended ? 256 : 0)),
+      keysym(0)
+  {}
+  void release(std::map<int,rdr::U32>* downKeysym) {
+    if (downKeysym->find(extendedVkey) != downKeysym->end()) {
+      keysym = (*downKeysym)[extendedVkey];
+      vlog.debug("fake release extendedVkey 0x%x, keysym 0x%x",
+                 extendedVkey, keysym);
+      writer->writeKeyEvent(keysym, false);
+    }
+  }
+  ~ModifierKeyReleaser() {
+    if (keysym) {
+      vlog.debug("fake press extendedVkey 0x%x, keysym 0x%x",
+                 extendedVkey, keysym);
+      writer->writeKeyEvent(keysym, true);
+    }
+  }
+  CMsgWriter* writer;
+  int extendedVkey;
+  rdr::U32 keysym;
+};
+
+// IS_PRINTABLE_LATIN1 tests if a character is either a printable latin1
+// character, or 128, which is the Euro symbol on Windows.
+#define IS_PRINTABLE_LATIN1(c) (((c) >= 32 && (c) <= 126) || (c) == 128 || \
+                                ((c) >= 160 && (c) <= 255))
+
+void win32::CKeyboard::keyEvent(CMsgWriter* writer, rdr::U8 vkey,
+                                rdr::U32 flags, bool down)
+{
+  bool extended = (flags & 0x1000000);
+  int extendedVkey = vkey + (extended ? 256 : 0);
+
+  // If it's a release, just release whichever keysym corresponded to the same
+  // key being pressed, regardless of how it would be interpreted in the
+  // current keyboard state.
+  if (!down) {
+    releaseKey(writer, extendedVkey);
+    return;
+  }
+
+  // We should always pass every down event to ToAscii() otherwise it can get
+  // out of sync.
+
+  // XXX should we pass CapsLock, ScrollLock or NumLock to ToAscii - they
+  // actually alter the lock state on the keyboard?
+
+  BYTE keystate[256];
+  GetKeyboardState(keystate);
+  rdr::U8 chars[2];
+
+  int nchars = ToAscii(vkey, 0, keystate, (WORD*)&chars, 0);
+
+  // See if it's in the Windows VK code -> X keysym map.  We do this before
+  // looking at the result of ToAscii so that e.g. we recognise that it's
+  // XK_KP_Add rather than '+'.
+
+  rdr::U32 keysym = ckeymapper.lookup(extendedVkey);
+  if (keysym) {
+    vlog.debug("mapped key: extendedVkey 0x%x", extendedVkey);
+    pressKey(writer, extendedVkey, keysym);
+    return;
+  }
+
+  if (nchars < 0) {
+    // Dead key - the next call to ToAscii() will give us either the accented
+    // character or two characters.
+    vlog.debug("ToAscii dead key (1): extendedVkey 0x%x", extendedVkey);
+    return;
+  }
+
+  if (nchars > 0 && IS_PRINTABLE_LATIN1(chars[0])) {
+    // Got a printable latin1 character.  We must release Control and Alt
+    // (AltGr) if they were both pressed, so that the latin1 character is seen
+    // without them by the VNC server.
+    ModifierKeyReleaser lctrl(writer, VK_CONTROL, 0);
+    ModifierKeyReleaser rctrl(writer, VK_CONTROL, 1);
+    ModifierKeyReleaser lalt(writer, VK_MENU, 0);
+    ModifierKeyReleaser ralt(writer, VK_MENU, 1);
+
+    if ((keystate[VK_CONTROL] & 0x80) && (keystate[VK_MENU] & 0x80)) {
+      lctrl.release(&downKeysym);
+      rctrl.release(&downKeysym);
+      lalt.release(&downKeysym);
+      ralt.release(&downKeysym);
+    }
+
+    for (int i = 0; i < nchars; i++) {
+      vlog.debug("ToAscii key (1): extendedVkey 0x%x", extendedVkey);
+      if (chars[i] == 128) { // special hack for euro!
+        pressKey(writer, extendedVkey, XK_EuroSign);
+      } else {
+        pressKey(writer, extendedVkey, chars[i]);
+      }
+    }
+    return;
+  }
+
+  // Either no chars were generated, or something outside the printable
+  // character range.  Try ToAscii() without the Control and Alt keys down to
+  // see if that yields an ordinary character.
+
+  keystate[VK_CONTROL] = keystate[VK_LCONTROL] = keystate[VK_RCONTROL] = 0;
+  keystate[VK_MENU] = keystate[VK_LMENU] = keystate[VK_RMENU] = 0;
+
+  nchars = ToAscii(vkey, 0, keystate, (WORD*)&chars, 0);
+
+  if (nchars < 0) {
+    // So it would be a dead key if neither control nor alt were pressed.
+    // However, we know that at least one of control and alt must be pressed.
+    // We can't leave it at this stage otherwise the next call to ToAscii()
+    // with a valid character will get wrongly interpreted in the context of
+    // this bogus dead key.  Working on the assumption that a dead key followed
+    // by space usually returns the dead character itself, try calling ToAscii
+    // with VK_SPACE.
+    vlog.debug("ToAscii dead key (2): extendedVkey 0x%x", extendedVkey);
+    nchars = ToAscii(VK_SPACE, 0, keystate, (WORD*)&chars, 0);
+    if (nchars < 0) {
+      vlog.debug("ToAscii dead key (3): extendedVkey 0x%x - giving up!",
+                 extendedVkey);
+      return;
+    }
+  }
+
+  if (nchars > 0 && IS_PRINTABLE_LATIN1(chars[0])) {
+    for (int i = 0; i < nchars; i++) {
+      vlog.debug("ToAscii key (2) (no ctrl/alt): extendedVkey 0x%x",
+                 extendedVkey);
+      if (chars[i] == 128) { // special hack for euro!
+        pressKey(writer, extendedVkey, XK_EuroSign);
+      } else {
+        pressKey(writer, extendedVkey, chars[i]);
+      }
+    }
+    return;
+  }
+
+  vlog.debug("no chars regardless of control and alt: extendedVkey 0x%x",
+             extendedVkey);
+}
+
+// releaseAllKeys() - write key release events to the server for all keys
+// that are currently regarded as being down.
+void win32::CKeyboard::releaseAllKeys(CMsgWriter* writer) {
+  std::map<int,rdr::U32>::iterator i, next_i;
+  for (i=downKeysym.begin(); i!=downKeysym.end(); i=next_i) {
+    next_i = i; next_i++;
+    writer->writeKeyEvent((*i).second, false);
+    downKeysym.erase(i);
+  }
+}
+
+// releaseKey() - write a key up event to the server, but only if we've
+// actually sent a key down event for the given key.  The key up event always
+// contains the same keysym we used in the key down event, regardless of what
+// it would look up as using the current keyboard state.
+void win32::CKeyboard::releaseKey(CMsgWriter* writer, int extendedVkey)
+{
+  if (downKeysym.find(extendedVkey) != downKeysym.end()) {
+    vlog.debug("release extendedVkey 0x%x, keysym 0x%x",
+               extendedVkey, downKeysym[extendedVkey]);
+    writer->writeKeyEvent(downKeysym[extendedVkey], false);
+    downKeysym.erase(extendedVkey);
+  }
+}
+
+// pressKey() - write a key down event to the server, and record which keysym
+// was sent as corresponding to the given extendedVkey.  The only tricky bit is
+// that if we are trying to press an extendedVkey which is already marked as
+// down but with a different keysym, then we need to release the old keysym
+// first.  This can happen in two cases: (a) when a single key press results in
+// more than one character, and (b) when shift is released while another key is
+// autorepeating.
+void win32::CKeyboard::pressKey(CMsgWriter* writer, int extendedVkey,
+                                rdr::U32 keysym)
+{
+  if (downKeysym.find(extendedVkey) != downKeysym.end()) {
+    if (downKeysym[extendedVkey] != keysym) {
+      vlog.debug("release extendedVkey 0x%x, keysym 0x%x",
+                 extendedVkey, downKeysym[extendedVkey]);
+      writer->writeKeyEvent(downKeysym[extendedVkey], false);
+    }
+  }
+  vlog.debug("press   extendedVkey 0x%x, keysym 0x%x",
+             extendedVkey, keysym);
+  writer->writeKeyEvent(keysym, true);
+  downKeysym[extendedVkey] = keysym;
+}