Transparent windows

[KenDown]

I don't think I've asked this before, but is there any way to create a transparent window in SDL?

Thanks.

[Hated Moron]

is there any way to create a transparent window in SDL?

This is a question about SDL2, not about BBC BASIC, so would be better asked at their forum. A Google search suggests that it's a question that has been asked (and answered) before. Here are a couple of hits:

SDL_SetWindowOpacity()
SDL transparent primary surface

You may well need to take a different approach depending on whether it must work on multiple platforms or just on Windows.