There are example programs for the DataHub APIs for C++, Java, and .NET that ship with the installation archive. If you go to the Windows Start menu and choose Cogent, you'll see .Net Test Application and C++ Test Application options. The source code for these applications is here (32-bit/64-bit versions of the DataHub program):

C:\Program Files (x86)\Cogent\API\

C:\Program Files\Cogent\API\