Top level interfaces can have a toolbar, which is typically displayed at the top of the window. On Cocoa, this will be a standard foldable toolbar.
The end user can raise a customization dialog to choose which items appear on the toolbar. See the
toolbar-items
and
toolbar-states
initargs for
interface
and the functions
interface-toolbar-state
,
interface-default-toolbar-states
,
interface-update-toolbar
and
interface-customize-toolbar
.