They use a language called BrigthScript that’s closest to Visual Basic. It was originally intended for digital signage. A few years back they “improved” it with XML crap that you have to use to describe public methods of your objects(!) and stuff. It was better before (docs and examples for old and new style exist).

Notable quirks include the XML companion files for code interface descriptions (in the newer SDK, anyway), and single = doing double-duty as assignment and comparison.

[edit] oh but my understanding is that big players get a different SDK with the ability to e.g. use C libraries, which is how they’re able to look & work so much like they do on other platforms.