An object is to provide a novel quinoxaline derivative, a light-emitting element with low driving voltage, and a light-emitting element which consumes low power. The first controller receives data from a host computer through a first communication channel; write the received data into the first storage device; identify part of the received data as first data, the part satisfying a preset particular condition; and write a replica of the first data as second data into the second storage device. The privacy fence system provides for installing a privacy fence that reuses existing cement anchored fence posts. If it is determined that the load for pressurizing Pm is larger than or equal to the load for detecting a bump Pc, the servo controller 17 determines whether the flag for stopping is ON. Responsive to receipt of the request by the physical adapter, the physical adapter modifies the resources allocated to the virtual adapter.