In recent linux kernels, the /proc/acpi/event interface has been deprecated. The same information (and more) is available via netlink (a way for the kernel to communicate with userspace that is usually used for networking) and the input layer (mouse, keyboard, power button, etc...). This version of acpid supports netlink and the input layer.
This is a branch of the original acpid project http://sourceforge.net/projects/acpid/ which is still potentially useful for non-Linux operating systems.
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