I hate do admit it, but I don't really know how to call on a DLL. >.< I don't really understand DLLs, UIs, Visuals, or Sounds in general since I don't get the numbers associated with them. I am still learning what numbers go with what colors, what numbers go with what visual elements, and so on.
Rather than a programming language, coffeescript and javascript would be script languages? Visual Novel Maker primarily uses json files for storing information and uses programming language for the launcher from what I know, but otherwise uses scripting language for a lot of the functions that can be modified.