The root of the SDK is the following
In the lib folder there are the NCryptoki's libraries: NCryptoki.dll.
NCryptoki.dll is the managed library that supplies the .NET classes that implements the NCryptoki object model.
If you download the zip package you may add the NCryptoki dlls in
the GAC by using registerInGAC.bat that you can find in the lib folder. Such a .bat uses the mygacutil.exe executable, in the root of the SDK, that adds an assemlby to the GAC.
In the example folder there are same example projects that briefly show how to use NCryptoki in C#, VB.NET and VB6. The VB6 project can be used also to see how to use NCryptoki as an ActiveX and can be useful to understand how to integrate NCryptoki in other languages that support COM interop.
In the docs folder there is the apidoc in .chm format and several other useful documents.