<!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook V3.1//EN"> <para>There are several undocumented settings for <varname>debug</varname>, among them <literal>3.27</literal> to enable a complete trace and <literal>3.8</literal> to debug the spell checker. For a complete list of the possible settings, see <filename class="headerfile">edit/debug.h</filename>.</para>