Specifies the main Cocoa application interface.
as the main application interface. This interface is used to supply the application menu and receives various callbacks associated with the application.
must be called before any CAPI functions that make the screen object (such as convert-to-screen and display)
should not be displayed like a normal interface.
is only applicable when running under Cocoa.
LispWorks CAPI Reference Manual - 21 Dec 2009