If you really need to see the system dialog, you can enum all top level windows when you get WM_DISPLAYCHANGE. You probably can track down the OS dialog, but this would be very fragile, so I would not recommend it. Any software can change the resolution using ChangeDisplaySettings. Graphics cards usually have their own software with or without some other dialog. You can change resolution without the dialog. Just hit the Windows button when the dialog is showing and look for it.
When you use the OS dialog, the launching process is explorer.exe. The 15 second window, with keep and revert buttons, is a #32770 dialog. It is not sent if you keep the resolution. That is, right before the dialog appears, and when you hit revert. It is sent when the resolution really changes.
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