Why does prevInstance exist in WinMain and wWinMain if it is always NULL

Question

Since I am a beginner, it may be a very basic question. I am starting DirectX 11, and while creating my first application, wWinMain was used, and while searching for difference

Answer 1

The prev instance parameter is there for 16-bit Windows compatibility. I think that was stated in the MSDN reference for WinMain, at least it used to be.