diff --git a/environment.yml b/environment.yml
index 9ceceb75..b913c4e6 100644
--- a/environment.yml
+++ b/environment.yml
@@ -5,3 +5,5 @@ channels:
 dependencies:
   - xeus-python=0.0.1
   - notebook
+  - ipywidgets>=7.4
+  - itkwidgets
diff --git a/notebooks/xeus-python.ipynb b/notebooks/xeus-python.ipynb
index 3cbf59e2..c14bc2c6 100644
--- a/notebooks/xeus-python.ipynb
+++ b/notebooks/xeus-python.ipynb
@@ -1,12 +1,13 @@
 {
  "cells": [
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [],
    "source": [
-    "from ipywidgets import IntSlider"
+    "<center>\n",
+    "    <img src=\"xeus-python.png\" width=\"50%\">\n",
+    "    <h1>Python kernel based on xeus</h1>\n",
+    "</center>"
    ]
   },
   {
@@ -15,25 +16,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "slider = IntSlider()"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "slider"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "slider.value"
+    "a = 3\n",
+    "a"
    ]
   },
   {
@@ -42,7 +26,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "slider"
+    "a"
    ]
   },
   {
@@ -51,7 +35,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "slider.value = 36"
+    "a += 6"
    ]
   },
   {
@@ -60,9 +44,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from ipywidgets import Video\n",
-    "video = Video.from_file(\"Big.Buck.Bunny.mp4\")\n",
-    "video"
+    "print(a)"
    ]
   },
   {
@@ -71,8 +53,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from ipywidgets import Widget\n",
-    "Widget.close_all()"
+    "a"
    ]
   },
   {
@@ -81,9 +62,12 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from IPython.display import Image\n",
-    "im = Image(url=\"marie.png\")\n",
-    "im"
+    "b = 89\n",
+    "\n",
+    "def sq(x):\n",
+    "    return x * x\n",
+    "\n",
+    "sq(b)"
    ]
   },
   {
@@ -92,13 +76,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from bqplot import pyplot as plt\n",
-    "import numpy as np\n",
-    "\n",
-    "plt.figure()\n",
-    "n= 100\n",
-    "plt.plot(np.arange(n), np.cumsum(np.random.randn(n) * 100.))\n",
-    "plt.show(display_toolbar=True)"
+    "sq(4)"
    ]
   },
   {
@@ -107,8 +85,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "a = 3\n",
-    "a"
+    "print(a)"
    ]
   },
   {
@@ -117,7 +94,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "a"
+    "import missing_module"
    ]
   },
   {
@@ -126,7 +103,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "a += 6"
+    "b = {\"a\": 2, \"b\": 3}"
    ]
   },
   {
@@ -135,7 +112,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "print(a)"
+    "b"
    ]
   },
   {
@@ -144,7 +121,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "a"
+    "print(b[\"a\"])"
    ]
   },
   {
@@ -153,7 +130,11 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "?"
+    "import time\n",
+    "\n",
+    "for x in range(5):\n",
+    "    print(x)\n",
+    "    time.sleep(1)"
    ]
   },
   {
@@ -162,23 +143,16 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "b = 89\n",
-    "\n",
-    "display(im)\n",
-    "\n",
-    "def test(x):\n",
-    "    return x * 2\n",
+    "import sys\n",
     "\n",
-    "test(b)"
+    "print(\"Error !!\", file=sys.stderr)"
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [],
    "source": [
-    "test(4)"
+    "# Widgets support"
    ]
   },
   {
@@ -187,7 +161,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "print(a)"
+    "from ipywidgets import IntSlider"
    ]
   },
   {
@@ -196,7 +170,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import missing_module"
+    "slider = IntSlider()"
    ]
   },
   {
@@ -205,7 +179,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "b = {\"a\": 2, \"b\": 3}"
+    "slider"
    ]
   },
   {
@@ -214,7 +188,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "b"
+    "slider.value"
    ]
   },
   {
@@ -223,7 +197,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from ipywidgets import IntSlider"
+    "slider"
    ]
   },
   {
@@ -232,16 +206,14 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "IntSlider()"
+    "slider.value = 36"
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [],
    "source": [
-    "print(b[\"a\"])"
+    "## Binary buffers support for widgets"
    ]
   },
   {
@@ -250,20 +222,16 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "print(b[\"c\"])"
+    "from ipywidgets import Video\n",
+    "video = Video.from_file(\"Big.Buck.Bunny.mp4\")\n",
+    "video"
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [],
    "source": [
-    "import time\n",
-    "\n",
-    "for x in range(10):\n",
-    "    print(x)\n",
-    "    time.sleep(1)"
+    "## Higher-level widgets libraries support"
    ]
   },
   {
@@ -272,9 +240,24 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import sys\n",
+    "try:\n",
+    "    from urllib.request import urlretrieve\n",
+    "except ImportError:\n",
+    "    from urllib import urlretrieve\n",
+    "import os\n",
     "\n",
-    "print(\"Error !!\", file=sys.stderr)"
+    "import itk\n",
+    "\n",
+    "from itkwidgets import view\n",
+    "\n",
+    "# Download data\n",
+    "file_name = '005_32months_T2_RegT1_Reg2Atlas_ManualBrainMask_Stripped.nrrd'\n",
+    "if not os.path.exists(file_name):\n",
+    "    url = 'https://data.kitware.com/api/v1/file/564a5b078d777f7522dbfaa6/download'\n",
+    "    urlretrieve(url, file_name)\n",
+    "\n",
+    "image = itk.imread(file_name)\n",
+    "view(image)"
    ]
   },
   {
diff --git a/notebooks/xeus-python.png b/notebooks/xeus-python.png
new file mode 100644
index 00000000..b1ac64de
Binary files /dev/null and b/notebooks/xeus-python.png differ
diff --git a/src/xcomm.cpp b/src/xcomm.cpp
index caba61dd..e01252cb 100644
--- a/src/xcomm.cpp
+++ b/src/xcomm.cpp
@@ -109,6 +109,14 @@ namespace xpyt
         };
     }
 
+    void register_post_execute(py::args, py::kwargs)
+    {
+    }
+
+    void enable_gui(py::args, py::kwargs)
+    {
+    }
+
     void register_target(py::str target_name, py::object callback)
     {
         auto target_callback = [target_name, callback] (xeus::xcomm&& comm, const xeus::xmessage& msg) {
@@ -141,12 +149,16 @@ namespace xpyt
             .def_property_readonly("kernel", &xcomm::kernel);
 
         m.def("register_target", &register_target);
+        m.def("register_post_execute", &register_post_execute);
+        m.def("enable_gui", &enable_gui);
 
         m.def("get_kernel", [m] () {
             py::object xeus_python = m.attr("_Mock");
             py::object kernel = m.attr("_Mock");
             py::object comm_manager = m.attr("_Mock");
 
+            xeus_python.attr("register_post_execute") = m.attr("register_post_execute");
+            xeus_python.attr("enable_gui") = m.attr("enable_gui");
             comm_manager.attr("register_target") = m.attr("register_target");
             kernel.attr("comm_manager") = comm_manager;
             xeus_python.attr("kernel") = kernel;