HP-UX Host Intrusion Detection System Release 4.0 Release Notes for HP-UX 11i v1 | HP-UX 11i v2

Installation
Preinstallation
Chapter 230
Preinstallation
Before installing Release 4.0 on a system that has a previous version of
HP-UX HIDS installed and running, HP recommends that you stop the
idsagent process.
IMPORTANT For systems that do not currently have any version of HP-UX HIDS
installed, HP recommends that you make a full backup of all
administration and agent systems before you install HP-UX HIDS.
Installation on agent systems requires a kernel rebuild (automatic) and
reboot.