With the old-fashioned Microsoft Dynamics NAV ERP (on-premise proposition by Microsoft), the traditional way for customizing the solution is to use the C/SIDE and C/AL languages.
C/SIDE is the standard integrated development environment (IDE) born with the first versions of Microsoft Dynamics NAV. With C/SIDE and the development environment application, you have access to all the NAV objects, and from here you can customize every part of the application:
With C/SIDE and by using the C/AL language, you can create new objects such as Tables, Pages, Codeunits and so on and you can edit standard ...