It is an object of the present invention to disclose a socket that is easy in use for optoelectrical interconnection. Light engines according to the present disclosure have integrated features that eliminate the need for additional components such as a Printed Circuit Board, a heat sink, a cover portion, a lens andor a reflective element. The group learning terminal is connected with the network and provided for group learning of a group of the students. For each of the ISCs, in exchange for private equity therein, the funding company issues a corresponding publicly tradable class of its own stock substantially based on the performance of the ISC. The contextual information may be used in conjunction with other information to derive the tokenskeys.