       <a href="to_python_converter.html#to_python_converter-spec">
            <code>to_python_converter</code></a>
          and registers itself as an
          <a href="lvalue_from_pytype.html#lvalue_from_pytype-spec">
            <code>lvalue_from_pytype</code></a> converter from Python objects
          into pointers to undefined types.
            Thus it may be used as a converter from opaque pointers into
          Python objects and vice versa.</p>

    <h4><a name="opaque_pointer_converter-spec-s