Squid is a web proxy server. It makes web requests in behalf of the client, and inspecting the returned and optionally caches that content so that the next time a client request is made, the content can be served from local disk. This can make web surfing faster. Squid can also forward its requests on to a content filter, such as DansGuardian.
This page lets you modify the authentication scheme of squid.
This process runs as a service. When you make and save changes, the configuration files for the service are changed. However, the changes will not be applied until you restart the service.