1</var> and
<var>ptr2</var> point to the same memory address and false otherwise.

<h4 class="subheading">Implementation-specific Notes</h4>

<p>The representation of foreign pointers varies across the various Lisp
implementations as does the behaviour of the built-in Common Lisp
equality predicates. Comparing two pointers that point to the same
address with <code>EQ</code> Lisps will return true on some Lisps, others require
more general predicates like <code>EQL</code> or <code>EQUALP</code> and finally
s