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....//Access first worksheet Worksheet worksheet = workbook . getWorksheets...//Add 10 to cells A1 and A2 worksheet . getCells (). get ( "A1"...