You can use the Classes menu to perform operations on any number of items selected in either the Subclasses area or the Superclasses area. If no items are selected, then the current class is operated on by the commands in this submenu. The standard actions commands described in Performing operations on selected objects are available in this submenu.
Choose Classes > Browse Metaclass to select, and describe in the normal way, the class of the selected classes, or the current class.
Note: If more than one item is selected, and the command chosen from the Classes menu invokes a tool which can only display one item at a time, then the extra items are added to the History > Items submenu of the tool, so that you can easily display them.
LispWorks IDE User Guide (Macintosh version) - 25 Nov 2011