bloated setup?

[Charles Malespin]

On Tue, 2005-12-20 at 10:20 +0530, (रेवंत) Revant Nandgaonkar wrote:
> Also turn off the unnecessary start up services/daemons
> from rcconf or bum.
> 
> (bum will also tell you why are the services running for)
> 

What are rcconf and bum?  Where are they and how do I change them?
Tried man for both and it didnt have an entry.  Plus, I dont know which
start up services or daemons to turn off cause I dont know which ones do
what and if it might screw my system...