AuthPAM provides PAM authentication to Tikiwiki just as Pear Auth does with LDAP.
It's mainly intended for those tiki admins who have integrated they're Linux boxes onto they're network's authentication using PAM;
for example in my case my Linux boxes authenticate trhough PAM to my Windows 2000 Active Directory Domain (via winbind and kerberos 5) so with AuthPAM
I can authenticate my networked users against tiki without adding them by hand.