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</refsect1>
<refsect1>
+ <title>Special Passive User Units</title>
+
+ <refsect2>
+ <title>graphical-session.target</title>
+
+ <para>This target is active whenever any graphical session is running. It
+ is used to stop user services which only apply to a graphical (X,
+ Wayland, etc.) session when the session is terminated. Such services
+ should have <literal>PartOf=graphical-session.target</literal> in their
+ <literal>[Unit]</literal> section. A target for a particular session
+ (e. g. <filename>gnome-session.target</filename>) starts and stops
+ <literal>graphical-session.target</literal> with
+ <literal>BindsTo=graphical-session.target</literal>.</para>
+
+ <para>Which services are started by a session target is determined by the
+ <literal>Wants=</literal> and <literal>Requires=</literal> dependencies.
+ For services that can be enabled independently, symlinks in
+ <literal>.wants/</literal> and <literal>.requires/</literal> should be
+ used, see
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ Those symlinks should either be shipped in packages, or should be added
+ dynamically after installation, for example using <literal>systemctl add-wants</literal>, see
+ <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
+ </para>
+
+ <example>
+ <title>Nautilus as part of a GNOME session</title>
+
+ <para><literal>gnome-session.target</literal> pulls in Nautilus as
+ top-level service:</para>
+
+ <programlisting>[Unit]
+Description=User systemd services for GNOME graphical session
+Wants=nautilus.service
+BindsTo=graphical-session.target
+ </programlisting>
+
+ <para><literal>nautilus.service</literal> gets stopped when the session stops:</para>
+
+ <programlisting>[Unit]
+Description=Render the desktop icons with Nautilus
+PartOf=graphical-session.target
+
+[Service]
+...
+ </programlisting>
+ </example>
+ </refsect2>
+ </refsect1>
+
+ <refsect1>
<title>Special Slice Units</title>
<para>There are four <literal>.slice</literal> units which form