int pascal ShowWindow(HWND hWnd, BOOL bVisible)
      < MS-WINDOWS equivalent >

  This function is used to show or hide a window and all of its child
windows.

Parameters
  hWnd is the window to display or hide.
  bVisible is TRUE if you want to display or unhide the window, or
   FALSE if you want to hide the window.

Returns
  Whatever the default window proc returns from a WM_SHOW message.