Make a window fullscreen

[tofiffe]

You've probably heard of programs that make windows that normaly don't support it fullscreen (I'm talking about many games that support windowed mode, but they is not any support for borderless window mode, so people made programs that allow you to do just that, how could something like that be achieved in c++? I've tried googling, but I can only find results about users trying to make fullscreen windows in their programs.

I was guessing the procedure would be similar as in a win32 program, but how do you actually force the window to fullscreen and at the monitor origin without damaging the resolution?