I am, alas, not overly familiar with HP-UX, but one option you might want to try is to run the Linux NIS code on HP-UX. If you can, use a test system, or at worst a test area on some system you have, but the Linux code is pretty generic as Unix code goes and ports pretty easily. Another option is to use LDAP. There are some portable versions of LDAP that can be built into security systems. Look at http://www.linux.com/enhance/newsitem.phtml?sid=113&aid=11094 and http://www.linux.com/enhance/newsitem.phtml?sid=113&aid=11100 for a start.
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