How to set keyboard focus to the other windows in the z-order?

[Joseph Marzbani]

I want to bring the window that has been activated before my application's window in the z-order and set keyboard focus to it. there are 3 API related to this job in Windows APIs: BringWindowToTop (...) SetActivatedWindow (...) SetForegroundWindow (...) I've been trying all possible combination of these functions since yesterday, but I failed. The problem is I can bring the windows I like to the front, but those never get keyboard-focused. I've also tried ShowWindow (...), but It failed to set the focus to the windows too. what to do?

[Lost User]

According to the MSDN documentation for SetFocus()[^] you can only set the focus to a window that is attached to your own message queue.

Just say 'NO' to evaluated arguments for diadic functions! Ash