>I am utlizando this function so that it returns me I number it of the
>PID, but this so this returning one I number negative. What this
>making of missed? If they alguem will be able to help, I am thankful
>me.
>
>Declare INTEGER GetWindowThreadProcessId IN win32api INTEGER hwnd, INTEGER @lpdwProcessId
>
>test_thread_id = GetWindowThreadProcessId(test_hwnd, @test_pid)
>where
>
>since ja I am thankful

Just a note, that API function has a return value of a Double Word.
Meaning the type cast is incorrect if you get negatives which could cause you some problems.