The File Description area displays information about any system member selected in the Plan area. If no such member is selected, information about the current system (the one named in the System area) is shown instead. The same pieces of information are shown as in the tree view. See Description area for details. As with other views, items selected in this area can be operated on using commands in the Description menu.
LispWorks IDE User Guide (Macintosh version) - 25 Nov 2011