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-<head>
-<title>UK TeX FAQ -- question label triptrap</title>
-</head><body>
-<h3>How can I be sure it&rsquo;s really TeX?</h3>
-<p/>TeX (and Metafont and MetaPost) are written in a
-
- <a href="FAQ-lit.html">&lsquo;literate&rsquo; programming</a> language called Web
-which is designed to be portable across a wide range of computer
-systems. How, then, is a new version of TeX checked?
-<p/>Of course, any sensible software implementor will have his own suite
-of tests to check that his software runs: those who port TeX and
-its friends to other platforms do indeed perform such tests.
-<p/>Knuth, however, provides a &lsquo;conformance test&rsquo; for both TeX
-(<code>trip</code>) and Metafont (<code>trap</code>).
-
-He characterises these as &lsquo;torture tests&rsquo;: they are designed not to
-check the obvious things that ordinary typeset documents, or font
-designs, will exercise, but rather to explore small alleyways off the
-main path through the code of TeX. They are, to the casual reader,
-pretty incomprehensible!
-<p/>Once an implementation of TeX has passed its <code>trip</code> test, or an
-implementation of Metafont has passed its <code>trap</code> test, then it may
-in principle be distributed as a working version. (In practice, any
-distributor would test new versions against &ldquo;real&rdquo; documents or
-fonts, too; <code>trip</code> and <code>trap</code> don&rsquo;t actually test any
-for real world problems.
-<p/><p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=triptrap">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=triptrap</a>
-</body>