CakePHP 1.2 & Auth

I trying to change my experience in CakePHP 1.1 into 1.2, and even find this useful article:

Setting Up User Groups With ACL/Auth in CakePHP 1.2

But.... I still don't understand how to I must work with all of this. I think I will use ob_auth (some modify for 1.2 version made by myself).

Also I found some bug (?) in cake.bat (console).

When I trying to: cake acl create aro ROOT ROOT

I get: Unknown type aro

But, If I use php 5, I have no error... So. May be My installation of PHP 4 is not so good for cake console? I don't know.