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I'm not sure you get it. This is hardware overlay. It's not running in user-space, it's being moved from memory to graphic card directly. A DirectX drawn window

I'm not sure you get it. This is hardware overlay. It's not running in user-space, it's being moved from memory to graphic card directly. A DirectX drawn window is not affected by focus or anything else. You can stop it by killing the process. If someone came ahead of time to prevent it from ever gaining screen access, then that would be a problem, but since the order of app launches are known and can be controlled, it would still work.

shimonamit 16y ago
In DirectX you will lose exclusive control of the screen and all rendering surfaces if your app loses focus. Retaining focus is not possible, unless by way of trickery. Game forums are riddled with developers trying to overcome this problem.
- maxklein 16y ago
  Not with DirectShow and the VMR filter.