The 16-character code provides access to Analysing Modern History Interactive Textbook, an online version of the student book that delivers a host of interactive features to enhance the teaching and learning experience. The Interactive Textbook is available as a calendar-year subscription. Your subscription term is defined as follows: if activation occurs between January and July of this year, subscription concludes on the 31st of December this year. If activation occurs between August to December of this year, subscription concludes on the 31st of December the following year.