Interrupting and restarting added in basic workflow

docs/source/interactive/htmlnotebook.rst

@@ -144,6 +144,9 b' be overcome in the future, but in the meantime, there is a way to debug problems'
 If your notebook is running on a local
 computer (i.e. if you are accessing it via your localhost address at ``127.0.0.1``), you can just type ``%qtconsole`` in the notebook and a Qt console will open up, connected to that same kernel.
 
+At certain moments, it may be necessary to interrupt a particularly long calculation, or even to kill the entire computational process. This may be achieved by interrupting or restarting the kernel, respectively.
+After a restart, all relevant cells must be re-evaluated
+
 
 Cell types
 ----------
@@ -178,7 +181,7 b' Raw cells provide a place to put additional information which is not evaluated b'
 
 Magic commands
 --------------
-Magic commands, or *magics*, are one-word commands starting with `%`, which give commands to IPython itself (as opposed to standard Python commands which are exported to be run in a Python interpreter).
+Magic commands, or *magics*, are one-word commands starting with `%%`, which give commands to IPython itself (as opposed to standard Python commands which are exported to be run in a Python interpreter).
 
 Magics control different elements of the way that the IPython notebook operates. They are entered into standard code cells and executed as usual with :kbd:`Shift-Enter`.
 
@@ -190,6 +193,11 b' Some of the main magics are the following:'
 * ``%config``
   Configuration of IPython
 
+* ``%timeit``
+  Time a single line of code.
+
+There are also *cell magics*, which start with ``%%``
+
 
 Plotting
 --------
@@ -209,15 +217,6 b' which captures the output inline within the notebook format. This has the benefi'
 
 
 
-
-`%matplotlib` and `%pylab` magics
-
-Inline versus non inline
-
-%config 
-
-
-
 Exporting a notebook and importing existing scripts
 ---------------------------------------------------