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<p><a name="index-tutorial_002c-_0040cffi_007b_007d-1"></a>Users of many popular languages bearing semantic similarity to Lisp,
such as Perl and Python, are accustomed to having access to popular C
libraries, such as <acronym>GTK</acronym>, by way of &ldquo;bindings&rdquo;.  In Lisp, we
do something similar, but take a fundamentally different approach. 
This tutorial first explains this difference, then explains how you
can use <acronym>CFFI</acronym>, a powerful system for calling out to C