Article: DOS USB Bootable Drive (the boot sector)

Hi. I stumbled on to this article while researching a problem I was having with installing Windows 2000.
»http://www.aselabs.com/articles.php?id=243

Anyways, I was wondering how the boot sector was written to the partition, and now I know (mostly).

In the procedure, one line reads "Boot sector kernel name set to KERNEL SYS."
Would this be comparable with kernel loading in Grub? With Grub, does the system partition still require a boot sector if Grub is essentially loading the kernel, which will take care of the rest of the booting when it is loaded? (< this second question is a guess).

I do not know how to load a kernel through Grub, though it appears that Grub is doing the work of a boot sector.

Just wanted to get this little bit of ambiguity out of my mind.
Thanks