Int 2F Fn 5480  U - Power.exe - Get/set ???                                [p]

   AX = 5480h
   BX = direction
       0000h get
       other set
   CX = size of buffer (at least 0010h)
   DS:SI -> buffer

Return: AX = status
       0000h successful
       other error code

See Also: AX=5400h,AX=5481h,AX=548Fh