When a visitor comes to my site on the main menu is a link titled "Articles". When they click on the link a page comes up with a list of all the articles. I want the visitor to register "for free" before they are able to read the articles. So right now I have each article set to access "Registered".

Now if they are not registered and click on an article a 404 error page comes up. I want to change the message on that error page to something like "You must be registered to view this page" and then have a link to the registered page.

But I don't want this custom 404 error page to come up whenever there's any kind of problem within the site. So my question is can you use ReDJ to make a specific error page that only comes up when someone clicks on a page they're not supposed to access without being registered?

If the answer is no, is there anything else inside of Joomla! 3.2 to accomplish my goal?