Menus (covered in Creating Menus) can have components that are also choices. These components are groups of items that have an interaction upon selection just like other choices. The
keyword is used to associate radio or check buttons with the group -- with the values
respectively. By default, a menu component has an interaction of
See Grouping menu items together for more details.
CAPI User Guide (Macintosh version) - 30 Aug 2011