Knoppix uses the program SYSLINUX - here http://syslinux.zytor.com/ is the main site. Go here http://www.wlug.org.nz/SysLinux for WIKI info on syslinux. Check the Knoppix FAQ on booting here http://www.knoppix.net/docs/index.php/FaqBooting for more info on the boot process.
I don't have any more info to contribute. I hope this helps.
James