custom design and development, for others, of computer programs for use in interactive on-line computer databases which feature (1) educational information, (2) entertainment information, (3) self-help information, and (4) productivity tools, namely, computer databases, spreadsheets, electronic calendars, electronic address books and time management programs; electronic retailing via computer terminals featuring a wide variety of goods; providing of information and information-based services through various wired and wireless communications networks in the fields of medical, legal, computers and other scientific and technical subjects; leasing or providing access to an on-line computer database in the fields of financial, business, weather, sports, entertainment, performance arts, hobbies, games, education, science, medicine, law and literature