A clamp pallet as a reference member is fixed to a table of a machining center. The device is based on the discovery that conduction through conductive composite materials in this configuration switches to a high resistance mode when exposed to voltages above a threshold voltage. The transmission gaps are defined in a first transmission time structure specific to a first system and determined relative to a second transmission time structure specific to a second system to permit measures for the second system to be taken in the first system. Then, the client computer accesses the file within the storage device by the access path via the designated relay server computer.