what does S99local correspond to? The distro I use, SUSE, has boot.local, which takes the place of rc.local for them, and it is executed before a runlevel is reached.

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An introduction to services, runlevels, and rc.d scripts

If this all still sounds a bit too complicated, you can instead simply make use of the /etc/rc.d/rc.local file. This script file is run once, before all other scripts have run but before the logon prompt appears. By default it looks something like:

#!/bin/bash## /etc/rc.local - run once at boot time

# Put any local setup commands in here: