with Self do {Form1,...}
  SetWindowPos(Handle, // handle to window
               HWND_TOPMOST, // placement-order handle {*}
               Left,  // horizontal position
               Top,   // vertical position
               Width,
               Height,
               // window-positioning options
               SWP_NOACTIVATE or SWP_NOMOVE or SWP_NOSIZE);

{* Other Values: }
HWND_BOTTOM
Places the window at the bottom of the Z order.
HWND_NOTOPMOST
Places the window above all non-topmost windows
HWND_TOP
Places the window at the top of the Z order.
HWND_TOPMOST
Places the window above all non-topmost windows.
The window maintains its topmost position even when it is deactivated.