A list of menu objects.
The generic function
is called by the system to compute the menu bar for a document-frame interface.
The set of visible menus in such an interface is typically made up from those of the frame and those of the active document within it.
There is a built-in unspecialized method that appends the menu bars of the two interfaces and is equivalent to this:
(defmethod capi:merge-menu-bars ((frame t)
You can customize the menu bar by adding methods which specialize on particular frame and document interface classes.
is implemented only in LispWorks for Windows.
CAPI Reference Manual - 15 Dec 2011