Run as Unix user: Default is 'nobody' or 'squid' dependent on system. If the cache is run as root, it will change its effective/real ID to this value.

Run as Unix group: Default is 'nogroup' or 'squid' dependent on system. If the cache is run as root, it will change its effective/real group ID to this value.

Proxy authentication realm: Specifies the realm name which is to be reported to the client for proxy authentication (part of the text the user will see when prompted their username and password).

Cache manager email address: Default is 'webmaster' or 'root' dependent on system. Email-address of local cache manager who will receive mail if the cache dies.

Visible hostname: If you want to present a special hostname in error messages, etc, then define this. Otherwise, the return value of gethostname() will be used. If you have multiple caches in a cluster and get errors about IP-forwarding you must set them to have individual names with this setting.

Unique hostname: If you want to have multiple machines with the same Visible hostname then you must give each machine a different Unique hostname so that forwarding loops can be detected.

Cache announce host: Hostname where announcement messages will be sent. Find out more about cache hierarchies from The Squid FAQ. Defaults to 'tracker.ircache.net' when announcement is enabled by setting an announce period.

Cache announce port: Host port where announcement messages will be sent. Defaults to 3131 when announcement is enabled.

Announcement period: Frequency of announcements. Enable announcements to a cache heirarchy by setting this to '1 day'. The default is '0' which turns off announcement.