At the moment there is no support for injecting the program into osu! to make it appear as if it is on top of osu! On Windows there can only ever be one full screen application on a monitor, anything that wants to appear on top has to inject itself into the renderer of the full screen application. Implementing support for something like this comes with a fair number of issues and things to consider so while I'm considering it, I'm not sure if or when I'll work on this.strykeer25 wrote:
I don't understand if on windows it is possible to overlay it on full screen mode. I tried it without full screen and it works perfectly, but due to the full screen mode being off, there is a considerable delay when pressing keys.
For a more detailed explanation see this community/forums/topics/552405?start=7636887 reply and this community/forums/topics/552405?start=7391965 reply.