ftp server help

I can't seem to figure out how to keep anonymous users out of my ftp server.
I would only like existing users of my box to access the server; could
someone point me in the right direction?

(couldn't find a HOWTO, and the FM on ftpaccess didn't seem to make any
sense)

Thanks

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Lucas Vogel, Software Developer
Exponent Failure Analysis Associates, Inc.
lvogel@exponent.com
(623)587-6739