    <para>
      The argument type <type>ugentype</type> refers to unsigned integer types,
      i.e. <type>uchar</type>, <type>uchar<replaceable>n</replaceable></type>,
      <type>ushort</type>, <type>ushort<replaceable>n</replaceable></type>,
      <type>uint</type>, <type>uint<replaceable>n</replaceable></type>, <type>ulong</type>,
      and <type>ulong<replaceable>n</replaceable></type>. <replaceable>n</replaceable> is 2,
      3, 4, 8, or 16.
    </para>
 <!-- 13-Oct-2011 -->