This application is directed to a system for remotely directing a host device to perform an operation using a key. The key may include a communications circuitry for transmitting data, for example a key identifier or an instruction to perform an operation, within a personal area network created by the communications circuitry. When a host device is within the personal area network, the key may transmit data received by a transceiver on the host device. In response to receiving the data, the host device may perform an operation (e.g., an authentication operation). In some embodiments, the key may transmit data identifying an operation for the host device to perform. In some embodiments, the host device may store in memory key identification information and an associated operation which may be retrieved when the key is brought in proximity of the host device.