In the days of DOS, we were able to debug the Command.com program. If you go into debug, it is easy to find the Autoexec.bat file being pulled up as the boot script as it displays in plain english. I've edited the first letter, changing it from an "a" to a "b" so the system boots from butoexec.bat. Create a backup of Autoexec to butoexec.bat, then edit butoexec.bat at will and have some fun.