A system for transmission of data between a first device operated by a first user and a second device includes a database that receives a first set of data input by the first user and a second set of data input by the second user. In one embodiment, the first set of data includes an immediate mode of access and/or one or more future modes of access of the first user which correlate to one or more specific time periods during which the future mode of access will become the immediate mode of access. Additionally, the first set of data can include a time-dependent schedule of the future mode of access of the first user.