 describe
the objects being locked as bytestrings consisting of the conference
room name, the date when it is needed, and the beginning of the
appropriate half-hour slot.</p>
      <p>Lockers are 32-bit numbers, so we might choose to use the User ID of
the individual running the scheduling program.  To schedule half-hour
slots, all the application needs to do is issue a <a href="../api_reference/C/lockget.html" class="olink">DB_ENV-&gt;lock_get()</a> call
for the appropriate locker/object pair.  To schedule