Menustrip objects defined for a window will override an applications Menustrip object.
MUIA_Window_Menustrip replaces the old and obsolete MUIA_Window_Menu tag.
Usually, you will create the menu object with MUI's builtin object library from a gadtools NewMenu structure, but its also OK to define the menu tree ''by hand'' using the Family class.
If you have a global menu for all your applications windows but you want some windows to have no menu, use the MUIA_Window_NoMenus tag.