INT 2F U - POWER.EXE - GET/SET POWER STATUS
        AX = 5401h
        BX = function
            0000h get status
                Return: BL = power management status
                            bit 0: CPU idle
                            bit 1: ???
            ???
Return: AX = function status
            0000h success
            else  error code
Note:   called by MS Windows 3.1 POWER.DRV
SeeAlso: AH=53h,AX=5400h,AX=5402h,AX=5403h

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