An object of type cocoa-default-application-interface
as the main application interface. This interface is used to supply the application menu and receives various callbacks associated with the application.
An application can only have one application menu and one dock menu. Because the LispWorks IDE already provides these menus, calling
set-application-interface while running the LispWorks IDE will add a submenu to the
application menu to contain the
of your application, and you can test them there. Likewise, a submenu will be added to the LispWorks Dock icon menu. Other aspects of the application interface can only be tested when running it standalone.
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017