For study purposes I loaded onto my website the scripts for Structured Access Control from Kevin's "Build Your Own Database Driven Website 3rd Edition, Oct 2004 printing, Ch 12 (pgs 265-274).

Testing the secure page:
http://www.clickbasics.com/access/admin.php
with the given username (foxmulder) and password (trustno1), nothing happed. Turns out the code in the book and the code archive has an error. Where access.inc.php has:
PHP Code:
 if (isset($_POST['login'])) {, etc. 
it should be
PHP Code:
 if (isset($_POST['username'])) {, etc. 
BTW, the editions of this book keep getting better and better. Keep up the good work, Sitepoint and Kevin.