What is the PRO IV Run time charge and why do I need it?

Munsoft Classic is developed in an Object Oriented programming Language called PRO IV. PRO IV is developed and continually enhanced by a London Stock Exchange listed company called Northgate Information Systems. The PRO IV Run Time charge is paid to Northgate for the license to use and the ongoing development of new features for PRO IV developed systems.
This means that Munsoft Classic will ALWAYS be up-to-date with the latest software technology.