HP-UX Event ManagerAdministrator's Guide

Introduction
Event Manager Events
Chapter 128
Other than the Event Manager, the operating system supports a few
other mechanisms through which system components can report event
and status information. The system logger, syslog is a familiar example
of event management system. It provides simple event distribution
facilities for other components to use, and its daemon actively manages
the event information it receives. By contrast, the cron daemon’s log file,
/var/adm/cron/log, is an example of a passive event mechanism. The
cron daemon writes new event information to the end of its file, and
takes no special action to notify interested entities when it does so.
Event Manager Event Model
Figure 1-2 shows a graphical representation of an event. The Event
Contents box shows items, such as the process identifier (PID) and the
name of the host system on which the event was generated that may be
included in the event. The Event Actions box shows some of the possible
actions performed on any event.