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<h4 class="subsection">3.2.1 The First Line of a Texinfo File</h4>

<p><a name="index-First-line-of-a-Texinfo-file-161"></a><a name="index-Beginning-line-of-a-Texinfo-file-162"></a><a name="index-Header-of-a-Texinfo-file-163"></a>
Every Texinfo file that is to be the top-level input to TeX must begin
with a line that looks like this:

<pre class="example">     \input texinfo   @c -*-texinfo-*-
</pre>
  <p class="noindent">This line serves two functions:

     <ol type=1 start=1>
<li>When the file is processed by TeX, the &lsquo;<samp><span class="samp">\input texinfo</span></samp>&rsquo; command
tells TeX to load the macros needed for processing a Texinfo file. 
These are in a file called <samp><span class="file">texinfo.tex</span></samp>, which should have been
installed on your system along with either the TeX or Texinfo
software.  TeX uses the backslash, &lsquo;<samp><span class="samp">\</span></samp>&rsquo;, to mark the beginning of
a command, exactly as Texinfo uses &lsquo;<samp><span class="samp">@</span></samp>&rsquo;.  The <samp><span class="file">texinfo.tex</span></samp>
file causes the switch from &lsquo;<samp><span class="samp">\</span></samp>&rsquo; to &lsquo;<samp><span class="samp">@</span></samp>&rsquo;; before the switch
occurs, TeX requires &lsquo;<samp><span class="samp">\</span></samp>&rsquo;, which is why it appears at the
beginning of the file.

     <li>When the file is edited in GNU Emacs, the &lsquo;<samp><span class="samp">-*-texinfo-*-</span></samp>&rsquo; mode
specification tells Emacs to use Texinfo mode.
       </ol>

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