Is it possible to draw a graphic (e.g. a rectangle) on a specific area of the screen, in order to be visible all the time even if a full screen application like a game is running?
I tried to accomplish this by making a window top most, but like I expected, it got hidden when another program was doing the same thing. Even if I restarted the application in the background it interfered heavily with other programs that were intended to run top most, so I don't think that's a solution.
So I thought that it maybe possible on a lower level e.g. by altering the screen output directly. Unfortunately I don't know much about the architecture in this case and searching the web didn't help at all, so I decided to ask the question here.