This tool allows you to examine the Common Lisp classes that are defined in your environment. You can look at the superclasses and subclasses of a given class and see the relationships between them, and you can examine the slots available for each class.
In addition, you can examine the functions and methods defined on a given class, or the precedence list or initargs for the class.
LispWorks IDE User Guide (Macintosh version) - 25 Nov 2011