[_bxg1]

I'm not an expert, but technically what it defines is the size of a "word", which is a basic unit of memory handled by the processor, used for - among other things - addresses. I think this might affect number precision too but I might be wrong. But regardless, most higher-level languages don't care about word size. Even C/++ code can be written such that it doesn't care about word size, though it can also be written such that it does.