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<a name="Invisible-comments"></a>
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<p>
Next: <a href="Visible-comments.html#Visible-comments" accesskey="n" rel="next">Visible comments</a>, Previous: <a href="Comments.html#Comments" accesskey="p" rel="prev">Comments</a>, Up: <a href="Comments.html#Comments" accesskey="u" rel="up">Comments</a> [<a href="Parameter-index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-index.html#Concept-index" title="Index" rel="index">Index</a>]</p>
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<a name="Invisible-comments-1"></a>
<h3 class="section">6.1 Invisible comments</h3>
<a name="index-Comments_002c-invisible"></a>
<dl compact="compact">
<dt><code>@z...@x</code></dt>
<dd><p>If a source or include file begins with ‘<samp>@z</samp>’ (in the very first
two characters of the file), then all material is skipped until and
including a line beginning in column 1 with ‘<samp>@x</samp>’ [except that
lines of the form ‘<samp>$Keyword: text of keyword $</samp>’<!-- /@w --> are processed; see
<a href="_0024KEYWORD.html#g_t_0024KEYWORD">$KEYWORD</a>, <a href="ATK_005f.html#ATK_005f">ATK_</a> (source files), or <a href="ATk.html#ATk">ATk</a> (include
files)].
</p>
</dd>
<dt><code>@%</code></dt>
<dd><p>All material until and including the next newline is completely ignored.
</p>
</dd>
<dt><code>@%%</code></dt>
<dd><p>As ‘<samp>@%</samp>’, but also skip blank lines that immediately follow the current line.
</p></dd>
</dl>
<p>For example,
</p>
<div class="example">
<pre class="example">@z
Author: J. A. Krommes
@x
@c @% This sets the global language to C.
@* EXAMPLE.
</pre></div>
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