[squid-users] authentication, userid and logs

how that squid manage the authentication?
when a client authenticate itself squid store the ip somewhere? and the
on it uses that ip to let him navegate?

im asking this, because im using squidanalyzer to parse out the squid
logs, and only shows once time the username and then only shows the ips

-- 
Patricio Bruna                                  http://www.linuxcenterla.com
Ingeniero de Proyectos                  Mariano Sánchez Fontecilla 310
Red Hat Certified Engineer              Las Condes, Santiago - CHILE
Linux Center Latinoamerica              Fono: 4834041