Hi!

Try looking into

/etc/rc2.d /etc/rc3.d ... /etc/rc{your runlevel}.d directories.

There are links to /etc/init.d/* startup scripts. Here is nearly all the magic.

root@llod-zion:/home/mtodorov# more /etc/rc2.d/README
The scripts in this directory are executed each time the system enters
this runlevel.

The scripts are all symbolic links whose targets are located in
/etc/init.d/ .

To disable a service in this runlevel, rename its script in this directory
so that the new name begins with a 'K' and a two-digit number, where the
number is the difference between the two-digit number following the 'S'
in its current name, and 100. To re-enable the service, rename the script
back to its original name beginning with 'S'.

For a more information see /etc/init.d/README.
root@llod-zion:/home/mtodorov#
Enjoy,

Marvin