Please share technical documentation for Q&A plugin

Hi, I was hoping you could give me a crash-course as to how all of your Q&A source code works. Do I have the full code? Or does some of the functionality/code live on your server? I would be more comfortable buying/supporting your products if a developer could dismiss my uncertainties. My uncertainties are that after downloading the plugin and viewing the .php files included with the download, I realized that I know nothing about how this plugin works. Can you give me technical documentation? Thank you!