For consistency:

- s/xdm/XDM
- remove application tags inside link tags.

en_US.ISO8859-1/books/handbook/x11/chapter.sgml

@@ -1434,7 +1434,7 @@ DisplayManager.requestPort:     0</screen>
           <secondary>display manager</secondary></indexterm>
         <para>An administrator of a multi-user system may wish to have
           a graphical login screen to welcome users.
-          <link linkend="x-xdm"><application>XDM</application></link> can be
+          <link linkend="x-xdm">XDM</link> can be
           used, as described earlier.  However,
           <application>KDE</application> includes an
           alternative, <application>kdm</application>, which is designed
@@ -1529,7 +1529,7 @@ esac</screen>
         <para>Now, make sure <application>kdm</application> is listed in
           <filename>/etc/ttys</filename> to be started at the next bootup.
           To do this, simply follow the instructions from the previous
-          section on <link linkend="x-xdm">xdm</link> and replace
+          section on <link linkend="x-xdm">XDM</link> and replace
           references to the <command>/usr/X11R6/bin/xdm</command>
           program with <command>/usr/local/bin/kdm</command>.</para>
       </sect3>