Applications have to be written with PAM library support.

To get a list of the applications on your system that can use PAM in some way, type:

ldd /{,usr/}{bin,sbin}/* | grep -B 5 libpam | grep '^/'

returns:

/bin/login:
/bin/su:
/sbin/mkhomedir_helper:
/sbin/pam_tally2:
/usr/bin/chfn:
/usr/bin/chsh:
/usr/bin/passwd:
/usr/sbin/atd:
/usr/sbin/chpasswd:
/usr/sbin/cron:
/usr/sbin/newusers:
/usr/sbin/sshd:

ldd $(which prog_name) | grep libpam

If it returns anything, then it can use PAM.