Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....//Instantiating a Workbook object //Opening the Excel file Workbook workbook...workbook = new Workbook ( "book1.xls" ); //Hiding the tabs of the...