Completly without any other graphics engine (no OpenGL, no DirectX, ...) the library produces correct and fast hidden lines calculations in any device context with just a couple of commands. The product is shiped with a complete and rather detailed description in windows help format and Adobe pdf file. Quite a lot of samples for Borland's Delphi and an ActiveX component to use the library in nearly each developing system complete the user friendly product and support develoCAD is always interested in.