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+===============
+System versions
+===============
+
+Mailman system information is available through the ``system`` object, which
+implements the ``ISystem`` interface.
+::
+
+    >>> from mailman.interfaces.system import ISystem
+    >>> from mailman.core.system import system
+    >>> from zope.interface.verify import verifyObject
+
+    >>> verifyObject(ISystem, system)
+    True
+
+The Mailman version is also available via the ``system`` object.
+
+    >>> print system.mailman_version
+    GNU Mailman ...
+
+The Python version running underneath is also available via the ``system``
+object.
+::
+
+    # The entire python_version string is variable, so this is the best test
+    # we can do.
+    >>> import sys
+    >>> system.python_version == sys.version
+    True