I have looked at the GNU GRUB Manual 1.99 at (http://www.gnu.org/software/grub/manual/grub.html) but I cannot find an explanation of what the kernel entry / command in the grub.conf file means. I get what's the meaning of that entry but where is described what it actually is and what are proper.
I suppose this entry / command was actual in GRUB Legacy, but I cannot find where it is described...