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-<head>
-<title>UK TeX FAQ -- question label triptrap</title>
-</head><body>
-<h3>How can I be sure it&#8217;s really TeX?</h3>
-<p/>TeX (and Metafont and MetaPost) are written in a
-
- <a href="FAQ-lit.html">&#8216;literate&#8217; 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 &#8216;conformance test&#8217; for both TeX
-(<i>trip</i>) and Metafont (<i>trap</i>).
-
-He characterises these as &#8216;torture tests&#8217;: 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 <i>trip</i> test, or
-an implementation of Metafont has passed its <i>trap</i> test, then it
-may in principle be distributed as a working version. (In practice,
-any distributor would test new versions against &#8220;real&#8221; documents or
-fonts, too; while <i>trip</i> and <i>trap</i> test bits of
-pathways within the program, they don&#8217;t actually test for any real
-world problem.)
-<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>