TAC is an implementation of TOC2.0 for AOL Instant Messaging.
Primary Method (Secure?):
toc2_login <auth_serv> <auth_port> <username> <password> <language> <client version> <country?> <country> <hash?> 3 0 03 0303 -kentucky -utf8 <hash>
Another method (less secure?):
toc2_signon <auth_serv> <auth_port> <username> <password> <language> <client> <hash>
denotes a numerical hash of the username/password (need an algorithm for this)