coordination and arrangement to reach purchase and sales agreements for goods which are purchased and sold via communication network systems including the internet; coordination and arrangement to reach purchase and sales agreements for downloadable data of images, pictures, voice, and sounds; computer management of files which includes data of images, pictures, voice, and sounds to be provided to users via communication network systems including the internet; marketing research; providing information concerning commercial sales; offering prizes, quizzes, and lotteries and conducting questionnaires to promote commercial sales and service provisions; providing information concerning prizes, quizzes, lotteries, and questionnaires which are offered or conducted to promote commercial sales and service provisions; employment agency; providing employment information; constructing and editing information in a computer database; retail services or wholesale services for data files of images, pictures, voice, and sounds