How to do PXE-boot when the BIOS doesn't support it at all?

<ul>
<li>gPXE's (formerly "etherboot") <a href="http://etherboot.org/wiki/removable#creating_a_bootable_cd-rom">boot CD</a>
    <ul>
    <li><a href="http://boot.kernel.org/Developer.html">boot.kernel.org</a> is a cool pre-built demo of how gPXE works
    </ul>
<li><a href="http://syslinux.zytor.com/archives/2003-January/001407.html">Microsoft also has a possible option</a> (I haven't researched this yet)
</ul>