If you have specified
Alt
or
Command
as the Emacs Meta key, then it acts as Meta when the input focus is in any
capi:output-pane
within any IDE tool. This includes the Text area of the Editor tool, the Listener area of the Listener tool, the Output areas of several tools, the echo area seen near the bottom of all tool windows, and graphs such as the Superclasses and Subclasses areas of the Class Browser.
LispWorks IDE User Guide (Macintosh version) - 25 Nov 2011