docs/upgrading/upgrade_4_0_lock_id_free.html

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  39       <p>A new locker ID related API, the <a href="../api_reference/C/lockid_free.html" class="olink">DB_ENV-&gt;lock_id_free()</a> method, was added to
  40 Berkeley DB 4.0 release.  Applications using the <a href="../api_reference/C/lockid.html" class="olink">DB_ENV-&gt;lock_id()</a> method to allocate
  41 locker IDs may want to update their applications to free the locker ID
  42 when it is no longer needed.</p>
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