I use Unity with some specific windows stuff to hide the border and make the background of the game invisible!
I misplaced the sources but I'll try to see if I can find them :)
Oh, thank you very much, I'm a computer enthusiast, I want to do "desktop goose" similar software, but do not know the principle, so I look everywhere for answers.
If you agree, you can send me a part of the code or tutorial that makes the window transparent, my email yinshaokai123@163.com, thank you!
My English is not very good, so if I make you uncomfortable, please forgive me.