diff --git a/js/x11/core/examples/vncviewer/vncgui.js b/js/x11/core/examples/vncviewer/vncgui.js
new file mode 100644
index 0000000..725bf4e
--- /dev/null
+++ b/js/x11/core/examples/vncviewer/vncgui.js
@@ -0,0 +1,129 @@
+"use strict";
+
+var rfb = require('./rfbclient');
+var x11 = require('../../lib');
+
+// TODO: use optimist for args parsing
+var host = process.argv[2];
+var port = process.argv[3];
+var password = process.argv[4]
+if (!host)
+    host = '127.0.0.1';
+if (!port)
+    port = 5900;
+
+var opts = {};
+opts.host = host;
+opts.port = port;
+opts.password = password;
+opts.rfbfile = process.argv[5];
+//opts.rfbFileOut = process.argv[5];
+
+
+
+
+var Exposure = x11.eventMask.Exposure;
+var PointerMotion = x11.eventMask.PointerMotion;
+var ButtonPress = x11.eventMask.ButtonPress;
+var ButtonRelease = x11.eventMask.ButtonRelease;
+var KeyPress = x11.eventMask.KeyPress;
+var KeyRelease = x11.eventMask.KeyRelease;
+
+x11.createClient(function(err, display) {
+    var X = display.client;
+    X.require('big-requests', function(err, BigReq) {
+        BigReq.Enable(function(err, maxLen) {
+            var keycode2keysym = [];
+            var min = display.min_keycode;
+            var max = display.max_keycode;
+            X.GetKeyboardMapping(min, max-min, function(err, list) {
+                for (var i=0; i < list.length; ++i)
+                {
+                    var keycode = i + min;
+                    var keysyms = list[i];
+                    keycode2keysym[keycode] = keysyms;
+                }
+
+
+        var root = display.screen[0].root;
+        var white = display.screen[0].white_pixel;
+        var black = display.screen[0].black_pixel;
+
+        var r = rfb.createConnection(opts);
+        r.on('connect', function() {
+
+            var wid = X.AllocID();
+            X.CreateWindow(wid, root, 0, 0, r.width, r.height);
+            X.ChangeWindowAttributes(wid, {
+                backgroundPixel: black,
+                eventMask: Exposure|PointerMotion|ButtonPress|ButtonRelease|KeyPress|KeyRelease
+            });
+            X.ChangeProperty(0, wid, X.atoms.WM_NAME, X.atoms.STRING, 8, r.title);
+            X.MapWindow(wid);
+
+            var gc = X.AllocID();
+            X.CreateGC(gc, wid, { foreground: black, background: white } );
+
+            //var pixbuf = X.AllocID();
+            //X.CreatePixmap(pixbuf, wid, 32, r.width, r.height);
+            //var pic = X.AllocID();
+            //Render.CreatePicture(pic, pixbuf, Render.rgba32);
+
+            var buttonsState = 0;
+            X.on('error', function(err) {
+                console.log(err);
+            });
+
+            X.on('event', function(ev) {
+                if (ev.type == 12) // expose
+                {
+                    // TODO: update only expose rect
+                    //X.PutImage(2, wid, gc, 128, 128, 0, 0, 0, 24, bitmap);
+                } else if (ev.type == 6) { // mousemove
+                    r.pointerEvent(ev.x, ev.y, buttonsState);
+                } else if (ev.type == 4 || ev.type == 5) { // mousedown
+                    var buttonBit = 1 << (ev.keycode - 1);
+                    // set button bit
+                    if (ev.type == 4)
+                        buttonsState |= buttonBit;
+                    else
+                        buttonsState &= ~buttonBit;
+                    r.pointerEvent(ev.x, ev.y, buttonsState);
+                } else if (ev.type == 2 || ev.type == 3) {
+                    var shift = ev.buttons & 1;
+                    var keysym = keycode2keysym[ev.keycode][shift];
+                    var isDown = (ev.type == 2) ? 1 : 0;
+                    r.keyEvent(keysym, isDown);
+                }
+            });
+
+            r.on('resize', function(rect)
+            {
+                X.ResizeWindow(wid, rect.width, rect.height);
+            });
+            r.on('rect', function(rect) {
+                if (rect.encoding == rfb.encodings.raw) {
+                    // format, drawable, gc, width, height, dstX, dstY, leftPad, depth, data
+                    X.PutImage(2, wid, gc, rect.width, rect.height, rect.x, rect.y, 0, 24, rect.buffer);
+                } else if (rect.encoding == rfb.encodings.copyRect) {
+                    X.CopyArea(wid, wid, gc, rect.src.x, rect.src.y, rect.x, rect.y, rect.width, rect.height);
+                } else if (rect.encoding == rfb.encodings.hextile) {
+                     console.log('hextile rec! (currently not fully supported');
+                     console.log(rect);
+                     rect.on('tile', function(tile) {
+                         X.PutImage(2, wid, gc, 16, 16, tile.x, tile.y, 0, 24, tile.buffer);
+                     });
+                }
+            });
+
+            X.on('end', function() {
+                r.terminate();
+            });
+
+        }); // r.on('connect)
+    }); // GetKeyboardMapping
+}); // BigReq.Enable
+
+}); // require('big-requests
+
+}); // x11.createClient