It is impressive indeed. The coding started just in time when Windows 95 were released. There was no Stackoverflow and they don't even really have internet back then. The programmer (as far as I know) didn't even speak English so he has access to book or two in German language and code snipets in help section of Delphi. At the same time creating applications with UI just started, so there was very little experience available, espcially in rural Austria.

Company did tried to migrate to other software few times, but the software is just too specific for given industry and legislation of small country that the companies who tried to create similar software usually went bankrupt soon.