Luke, I am only an intermediate Python coder, some pyQt experience but new to Qt itself. I am creating an app for a small wind tunnel; reads a dozen sensors via serial data from Arduino and displays data in digital form in labels ( like meters ) and plots line with your large array app embedded on overall window. What is best way to make it a callable How do I modify it to make it a callable module from another python app? I have tried numerous approaches using name __main __ but always get errors.