The * in the passwd field, if listed for all users, indicates that you are using C2 security on your HP system. Otherwise known as "trusted". The encrypted password(s) are stored in /tcb/files/auth/. From here there are 52 directories or so named all the letters in the alphabet, upper and lower case. With in these directories there is a file for every user in the /etc/passwd file. This file contains the encrypted password and other user restrictions, like login times, valid HW, so on sn so forth. If the HP system was not using C2 security, you would see the encrypted password's in the /etc/passwd file. I believe HP stopped using the /etc/shadow file after the 9.04 version of HP-UX.
crowe