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<A NAME=WHEN>

<TITLE>WHEN</TITLE></A>
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<B>WHEN</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>when</em> operator is used inside a <em>rule</em> to make the 
execution of the rule depend on a boolean condition which is 
evaluated at execution time. For the use see 
<A HREF=r37_0060.html>rule</A>. 
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