This Document is a brief description of the internals of the boot up process. It basically covers in detail how the machine boots using SysV Init and the differences between the original Init used in older Slackware releases.
Init is the program that gets run by the kernel at boot time. It is in charge of starting all the normal processes that need to run at boot time. These include the gettys that allow you to log in, NFS daemons, FTP daemons, and anything else you want to run when your machine boots.