[Wild.Bill.Kelso]

What is your application?

You are half right. It is a API call on the Window object. But not of the game/app window. The idea is to not 'give' focus to your app. Thus the game remains the current focus. It's been a long time since I've used it. But it might be the SetWindowPos API function using the NOACTIVATE parameter. Or something like that. You call the API and pass it the hWnd Handle of your window, and tell it to not allow it never to become the active window. You will be able to click on it, but not type text into it since it is not the active window.

WBK