Find the HOWTO or step-by-step guide that you need right here.
Here's a pretty well-written introduction to utilizing the access control mechanisms built into Apache. This includes the Apache security modules, controlling access by IP and username, using htaccess/htpasswd, among others.
Outlines the things you will probably have to do when you want to setup a network of computers under your own domain. Covers configuration of network parameters, network services, and security settings.
