You want Mac OS X to behave like OS 9 when it comes to file permissions? Well, first you have to enable root (the super user, alowed to do anything he/she wants, just like in OS 9). To do that, launch NetInfo Manager (in the Utilities folder in the Applications folder) and select Domain menu ->Security sum-menu ->Enable Root menu item. It will ask for your admin password, this is the password you entered when you installed OS X. Enter the password you want root to have. Now, quit NetInfo and log out. For your login name, type "root". For the password, enter the password that you entered for root. Note: they say not to always log in as root, but I don't care. It's just as dangerous as OS 9, and it's not like I accidentally deleted the System Folder.