APEX Listener PL/SQL Validations

There's a 2 ways to lockdown which applications/URLS are accessible for any APEX installation with the APEX Listener. First, I showed the new javascript method in the 2nd half of this post.  This is very nice as it stops any database communication at all. Now let's talk about the PL/SQL validation function and the part that I forgot to document.  The normal  PL/SQL Validation that has been in