[[the question of how an application can force some part of itself as the top level window is a FAQ]]

Could someone please write something here about the topic?

ptk*

'''Win32'''

The API function needed is:

  SetWindowPos(HWND hWnd,       // handle to window
               HWND hWndAfter,  // placement order handle
               int x, int y,    // position (horizontal, vertical)
               int cx, int cy,  // size (width, height) 
               UINT uFlags)     // positioning flags

The placement order handle can be either another HWND or once of the following constants:
    HWND_BOTTOM ''1'':    Moves to the bottom
    HWND_NOTOPMOST ''-2'':    Place above all non-topmost windows.
    HWND_TOP ''0'':    Move to the top
    HWND_TOPMOST ''-1'':    Move to the top and keep it there.