What are each of these services

Im stripping down a box and need to know what each of these services do. I have a few other running that I know about but I need to find out about these to figure out whether to turn them off or leave them on.

syslog
netfs
network
random
pcmcia
keytable
atd
gpm
autofs


Also on the RHN service
rhnsd

Do I have to leave that on to use up2date? Or can I turn the service off and up2date will still work, the RHN website just won't be able to do stuff on it's own?

 

 

 

 

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