If you turn off the menu option O_ONEVALUE (e.g., with
set_menu_opts or menu_opts_off; see menu_opts(3X)), the menu
becomes multi-valued; that is, more than one item may
simultaneously be selected.
In a multi_valued menu, you can used set_item_value to select the
given menu item (second argument TRUE) or deselect it (second
The function set_item_value returns one of the following:
E_OK The routine succeeded.
System error occurred (see errno(3)).
The menu driver could not process the request.
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