If you have followed this example from the beginning, the interface is now completely specified. You can now save the source code definition in a file.
to save the interface definition. Choose a directory in the dialog that appears, and specify the filename ib-example.lisp in the "File name" text box.
The file ib-example.lisp is displayed in an Editor tool.
LispWorks IDE User Guide (Windows version) - 13 Sep 2017