ACPI
Advanced Configuration & Power Interface

ADVANCED CONFIGURATION AND POWER INTERFACE SPECIFICATION
Revision 3.0a,  December 30, 2005
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The Advanced Configuration and Power Interface Specification, Revision 3.0a describes the structures and mechanisms necessary to design operating system-directed power management and make advanced configuration architectures possible. ACPI applies to all classes of computers. If you want to design and build an ACPI-compatible system, you need the ACPI Specification.