Re: controlling "background services", closing ports

I recently installed fedora core 5 on two systems. Is the system/administration/services GUI thing discussed in the documentation somewhere? (I can't seem to find anything except selinux.) I'd like to know a bit more about what the consequences of turning off some services might be. There is a terse description available in the tool, but it doesn't make it clear what will happen if I turn 'em off. For instance, I don't really know whether I need to "Listen and dispatch ACPI events from the kernel. (acpid)" Hate to just turn them all off & see what breaks. Also, I'm running nmap and lsof to try to figure out my open ports so I can close those I don't need and tell the firewall about the ones I do need. <...> I hope this is the right forum for these questions. Thanks in advance for any answers! TDB