A universal identifier can be used in various contexts, to identify
different kinds of devices for example. This page I think answers
your other questions:
http://syslinux.zytor.com/pxe.php
To make your life easier, if you're setting up a kickstart/PXE
environment for the first time, you probably should check out:
https://fedorahosted.org/cobbler/wiki/CobblerLiveCd
-Ed
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