A copy of the Java API documentation is installed under the API folder in your Kapow installation folder, for example C:\Program Files\Kofax Kapow 10.3.2\API. Open the Overview.html file from the API folder and browse for the topic you are interested in.

You can also read the Developer's Guide that contains information about programming for Kapow. The guide can be accessed in the Kapow > Documentation on the Start menu.