session on multiple files

I have a script that mandates authentication, then after the user is allowed to view the file. I can verify that the file is not viewable unless the user is authenticated by going straight to the file w/o authenticating. However, I need the script to mandate authentication for several other files as well in addition to the one already in the script ( inner.sanctum.php ). The script can be viewed here: http://probsd.org/login.txt Could someone point me in the right direction in how to encapsulate a session around multiple files please? - Steve