How create device without window?
In MSDN -
| renderWindowHandle | System.IntPtr
This parameter indicates the surface to bind to the device. For full-screen mode, the window specified must be a top-level window. For windowed mode, this parameter can be null. If null is specified, a non-null handle must be specified when calling Device.Present. This can be done either by setting the PresentParameters.DeviceWindow property, or by using the optional param_Control_overrideWindow parameter of the Device.Present method. |

