</para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         The length of the function result value, in bytes (this count
         does not include itself).  Can be zero.
         As a special case, -1 indicates a NULL function result.
         No value bytes follow in the NULL case.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Byte<replaceable>n</replaceable></term>
       <listitem>
        <para>
         The value of the function result, in the format indicated by
         the associated format code.
         <replaceable>n</replaceable> is the above length.
        </para>
       </listitem>
      </varlistentry>
     </variablelist>
    </listitem>
   </varlistentry>

   <varlistentry id="protocol-message-formats-GSSENCRequest">
    <term>GSSENCRequest (F)</term>
    <listitem>
     <variablelist>
      <varlistentry>
       <term>Int32(8)</term>
       <listitem>
        <para>
         Length of message contents in bytes, including self.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32(80877104)</term>
       <listitem>
        <para>
         The <acronym>GSSAPI</acronym> Encryption request code.  The value is chosen to contain
         <literal>1234</literal> in the most significant 16 bits, and <literal>5680</literal> in the
         least significant 16 bits.  (To avoid confusion, this code
         must not be the same as any protocol version number.)
        </para>
       </listitem>
      </varlistentry>
     </variablelist>
    </listitem>
   </varlistentry>

   <varlistentry id="protocol-message-formats-GSSResponse">
    <term>GSSResponse (F)</term>
    <listitem>
     <variablelist>
      <varlistentry>
       <term>Byte1('p')</term>
       <listitem>
        <para>
         Identifies the message as a GSSAPI or SSPI response. Note that
         this is also used for SASL and password response messages.
         The exact message type can be deduced from the context.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         Length of message contents in bytes, including self.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Byte<replaceable>n</replaceable></term>
       <listitem>
        <para>
         GSSAPI/SSPI specific message data.
        </para>
       </listitem>
      </varlistentry>
     </variablelist>
    </listitem>
   </varlistentry>

   <varlistentry id="protocol-message-formats-NegotiateProtocolVersion">
    <term>NegotiateProtocolVersion (B)</term>
    <listitem>
     <variablelist>
      <varlistentry>
       <term>Byte1('v')</term>
       <listitem>
        <para>
         Identifies the message as a protocol version negotiation
         message.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         Length of message contents in bytes, including self.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         Newest minor protocol version supported by the server
         for the major protocol version requested by the client.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         Number of protocol options not recognized by the server.
        </para>
       </listitem>
      </varlistentry>
     </variablelist>

     <para>
      Then, for protocol option not recognized by the server, there
      is the following:
     </para>

     <variablelist>
      <varlistentry>
       <term>String</term>
       <listitem>
        <para>
         The option name.
        </para>
       </listitem>
      </varlistentry>