DIDAPI SDK setup installs 'didapiUI.dll' file and all necessary library and device driver files.
The setup is found in 'Support\Didapi\Windows\Setup' folder.

Document 'DidapiUI_Interface.doc' is in the folder 'Support\Didapi\docs'.

An example of implementing a dynamic library containing necessary DIDAPI function calls is 
in the folder 'Support\Didapi\Windows\DidapiUI_old'. It is not compatible with the new 'didapiUI.dll'
library in the DIDAPI SDK setup.