Oneof the standard regarding the power control of the personal computer.OS cooperating with BIOS,the system in order to manage the electric power of each part inside the computer of being standardized is decided. The Intel corporation,the Microsoftcorporation andToshibabeing joint in 1996 December, first standard was decided.

Until recently, the system,APM was used for control of electric power, but thisbeingsomething whichdecidesexchanging between OS and BIOS,only rough management was possible from OS side. By the fact that ACPI is used,OS being center, power control function of each equipment to be small it reached the point where it can set & can manage.

ACPI is utilized,OSandBIOS, it is necessary for everything of the equipment which we would like to manage to be corresponding.Atthe Microsoft corporation,OS of the same company afterthe Windows98 all usually is made ACPI correspondence.