added saving notes

notebooks/session_1.ipynb

@@ -4,7 +4,14 @@
          "cell_type": "markdown",
          "metadata": {},
          "source": [
-            "# Session 1"
+            "# Practical session 1: First steps with the simulator"
+         ]
+      },
+      {
+         "cell_type": "markdown",
+         "metadata": {},
+         "source": [
+            "If you haven't done it yet, first make a copy of this document on which you will work. To do so, use `File -> Make a copy`. This will open a new tab with a copy of this document. Rename it by clicking on the document title `practical_session_1-Copy1` at the top of the document and enter the new name `YourName_pratical_session_1` (if you are in a group of several students, please indicate all names). Close the previous tab with the original document to prevent messing up with the two versions. **Important note if you are working from a university computer:** it is well possible that the files you store on the computer are not persistent across sessions, which means that if you log out, all the files you have stored will most likely have disappeared next time you will log in. In that case, please **systematically save your work either on a USB stick or by sending it to your own email address before logging out.** Typically, the file you want to save will be the current document."
          ]
       },
       {
@@ -411,7 +418,8 @@
          "source": [
             "The code above will take a while to be executed (approximately `1000 * 0.1 = 100` seconds). During this time, you can't execute anything else in this notebook. To stop the execution before it terminates by itself, press the \"stop-like\" button in the top menu bar of this document. \n",
             "\n",
-            "In the next practical session, we will see more fancy ways of defining reactive behaviours for the robot. And in the next ones, still more and more fancy stuffs."
+            "In the next practical session, we will see more fancy ways of defining reactive behaviours for the robot. And in the next ones, still more and more fancy stuffs.\n",
+            "Before logging out and leaving the class room, do not forget to save your work (see the note at the beginning of this notebook) and to send it to Laura and I by email. Close the simulator session by executing:"
          ]
       },
       {