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<p>For this reason a reference is often said to "point to" the data. Other implementations include an offset (difference) between the datum's address and some fixed "base" address, an <a href="page.php?w=array_index">index</a>, or <a href="page.php?w=identifier">identifier</a> used in a <a href="page.php?w=lookup">lookup</a> operation into an <a href="page.php?w=Array_data_structure">array</a> or <a href="page.php?w=table_%28database%29">table</a>, an operating system <a href="page.php?w=Handle_%28computing%29">handle</a>, a <a href="page.php?w=physical_address">physical address</a></p><p>
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