am-fd</tt> as an argument, except that a deadline
      associated with the stream object will be taken into account, and
      that the stream will be closed automatically.  As with file
      descriptor arguments, no I/O will actually be done on the stream
      object.
    </p>
    <p>
      <tt>certificate</tt> is the path to a file containing the PEM-encoded
      certificate. 
    </p>
    <p>
      <tt>key</tt> is the path to the PEM-encoded key, which may be associated 
      with the passphrase <tt