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<H1><A NAME="sec:6"><SPAN class="sec-nr">6</SPAN> <SPAN class="sec-title">Special 
Variables and Coroutining</SPAN></A></H1>

<A NAME="sec:extvar"></A>

<P>This chapter deals with extensions primarily designed to support 
constraint logic programming (CLP).

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<H2>Section Index</H2>

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<DIV class="toc">
<DIV class="toc-h2"><A class="sec" href="attvar.html"><SPAN class="sec-nr">6.1</SPAN> <SPAN class="sec-title">Attributed 
variables</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="attvar.html#sec:6.1.1"><SPAN class="sec-nr">6.1.1</SPAN> <SPAN class="sec-title">Special 
purpose predicates for attributes</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="coroutining.html"><SPAN class="sec-nr">6.2</SPAN> <SPAN class="sec-title">Coroutining</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="gvar.html"><SPAN class="sec-nr">6.3</SPAN> <SPAN class="sec-title">Global 
variables</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="gvar.html#sec:6.3.1"><SPAN class="sec-nr">6.3.1</SPAN> <SPAN class="sec-title">Compatibility 
of SWI-Prolog Global Variables</SPAN></A></DIV>
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