veloper.<br></li>
  <li>Second, and more significantly for the
      end user, some application developers might force a
      particular look and feel to be used. When this approach is used,
      the end user can't even use the enhanced look and feel.</li>
</ul>

<p>
A multiplexing look and feel
both these problems simultaneously because it allows multiple look
and feels to be combined.
The first problem (having to use what amounts to a second copy of the same
code) is solved because the developer can cre