I've been searching far and wide for a way to get the title bar size of any active window. What I'm trying to accomplish is moving the mouse to the top left corner of the window (so as to find true window position, relative to screen origin), the corner position where the window borders meet. I'm able to do this for some windows, but other windows do not have the title bar within the client area. So I have to find the title bar size in order to position the mouse where I want it. I've seen suggestions to use _WinAPI_GetSystemMetrics() but it returns a constant, and some windows have a differen