The Win16 API was written in C, not Pascal. But because it didn't have functions with a variable number of arguments, they could use the Pascal calling conventi

The Win16 API was written in C, not Pascal. But because it didn't have functions with a variable number of arguments, they could use the Pascal calling convention instead of the C one. It was slightly faster and saved a few bytes at each call point, which was a big deal back when memory was measured in kilobytes.