voluntary, intentional, deliberate, willing mean done or brought about of one's own will. voluntary implies freedom and spontaneity of choice or action without external compulsion. a voluntary confession; intentional stresses an awareness of an end to be achieved. the intentional concealment of vital information deliberate implies full consciousness of the nature of one's act and its consequences. deliberate acts of sabotage
PAM is a framework that assists applications in performing what I'll call authentication-related activities. The core pieces of PAM are a library (libpam) and a collection of PAM modules, which are dynamically linked libraries (.so) files in the folder /lib/security.
PAM under Red Hat stores its configuration files in the /etc/pam.d directory, which will contain a text file for each application that uses PAM for authentication. For instance, the file /etc/pam.d/gdm contains the PAM configuration information for the Gnome Desktop Manager (GDM), the default windowing environment for Red Hat.