What is the use of the below given tables in Joomla Database?

What is the use of the below given tables in Joomla Database?

jos_core_acl_aro jo开发者_如何学编程s_core_acl_aro_groups jos_core_acl_aro_map jos_core_acl_aro_sections jos_core_acl_groups_aro_map

ACL stands for "Access control list", so probably it has to do with user rights management, who is admin, who is mod etc, what kan and can't they do etc...

EDIT: ACL management is a new feature for joomla 1.6 http://docs.joomla.org/ACL_Tutorial_for_Joomla_1.6