Wondering whether any external device needs to be added via the parallel port, also about the purpose of the program in reality?
You can check the official website of the developer to see an example on what the software can do and where it can be implemented. The example on its website presents a visual interface to the sequencer that controls the parallel ports. Access the website to read more about it. Scroll down to the bottom of the page to see its changelog and to obtain a download link.