A system, apparatus and method utilize a micro electronic device implanted in a person or group of persons, or wearable thereby, to manage a variety of activities, including interrogating an RF microdevice for information. The microdevice has a housing, an antenna, a microprocessor, a tuning capacitor, and a transducer such as a location transponder, a thermometer, a heart rate transducer, a blood pressure transducer, and an information storage element. The method includes the steps of providing the microdevice and attaching it to a person. The person brings the microdevice near a login system having an RF reader and a login processor. The reader communicates with the microdevice via RF signals, and signals the login processor to corroborate an identification code from the microdevice. If the login processor corroborates the identification code, it signals the microdevice to permit access to information from the transducer. If the login processor does not corroborate the identification code, access to the information is not permitted.