tify a command. </td></tr>
<tr>
<td>Reserved </td><td>The field above is reserved for future extension. </td></tr>
<tr>
<td>**** </td><td>The field above has exactly one occurrence. </td></tr>
<tr>
<td>++++ </td><td>The field above has a variable length. </td></tr>
<tr>
<td>////// </td><td>The field above is repeated and may appear 0..n times. </td></tr>
</table>
<p>The commands are described in a structure consisting of three lines.</p>
<ul>
<li>The first line indicates the field type.</li>
<li>The second 