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<title>Registers (The GNU Troff Manual)</title>
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<h3 class="section" id="Registers-1">5.8 Registers</h3>
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<p>In the <code class="code">roff</code> language, numbers can be stored in <em class="dfn">registers</em>.
Many built-in registers exist, supplying anything from the date to
details of formatting parameters. You can also define your own.
See <a class="xref" href="Identifiers.html">Identifiers</a>, for information on constructing a valid name for a
register.
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