Development kit is the set of libraries and examples providing access to all features.Therefore, it is possible to write an own application.
Development kit contains libraries for MS Windows 98SE, MS Windows ME, MS Windows 2000, MS Windows XP, Windows Vista, Windows 7, Windows 8 and Windows 10(1903) operating systems. It contains libraries' description and examples written in Inprise Delphi, Inprise C++ Builder, Visual C++ 6.0, Visual Basic 6.0, C#.NET and Visual Basic .NET.