Registered only is a plugin to make all of your WordPress powered weblog/site protected. Once this plugin is enabled, the WordPress powered site or we
No, you cannot. This plugin will make the entire weblog and all the Pages, if you have any, protected against un-registered users.
After you activate the plugin, log out, and try to access your weblog. You should not be able to access it. Also, once you log in, all pages should be accessible to you in a perfectly normal fashion :)