pkg://acpid-1.0.1-fr1.src.rpm:21486/HEADER  downloads

Name        : acpid                        Relocations: (not relocateable)
Version     : 1.0.1                             Vendor: Freshrpms.net
Release     : fr1                           Build Date: Thu Oct 10 23:39:36 2002
Install date: (not installed)               Build Host: psyche.freshrpms.net
Group       : System Environment/Daemons    Source RPM: (none)
Size        : 20241                            License: GPL
Packager    : Matthias Saou <matthias.saou@est.une.marmotte.net>
URL         : http://acpid.sourceforge.net/
Summary     : Advanced Configuration and Power Interface event Daemon.
Description :
ACPID used to try to handle events intternally.  Rather than try to climb an
ever-growing mountain, ACPID now lets YOU define what events to handle.  Any
event that publishes itself to /proc/acpi/event can be handled.

ACPID reads a set of configuration files which define event->action pairs.
This is how you make it do stuff. See the man page for details.