common freebsd mount points?

I ran the df command last night to check slice sizes in anticipation of doing some backup and eventual tranfer to a new machine.
The output gave me not just normal slices that were created at install but also three additional (mount points?)
/proc
/net
/host

The machine is a simple web server and print server with little else on it. Can some explain to me (or point me to) an explanation of mount points?
Thanks,
Graham/

--

Graham North
Vancouver BC
Canada

www.soleado.ca

Kindness is infectous, try it.

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