Digital library appALTER the reader, which can run ALTER textbook publishing on tablets. App-textbooks correspond to the extent and structure of printed titles. Selected titles also contain interactive elements. App-textbooks are suitable for school teaching and pupils homework.Application features: - Intuitive user-friendly operation - Easy orientation in a publication - Easy browsing and active content - Zooming - Remembering your reading chapters / pagesFurther functions for selected films: - Supplementing omissions from the menu - Correspondence responses - Evaluating the correctness of the solution (feedback) - The repair of wrong solutions - Songs and spoken texts - Image and text attachmentsLibrary appALTER: - Download publications available from the server - Sorting books by keywords - My Books