The section does not apply to LispWorks Personal Edition.
LispWorks comes with source code for the editor, which you can refer to when adding editor extensions.
The directory lib/8-0-0-0/src/editor/
contains most of the source files of the LispWorks editor. Some low-level source code is not distributed.
To enable location of editor definitions by Find Source and related commands, configure LispWorks as described under 13.7 Finding source code in the LispWorks® User Guide and Reference Manual.
Some care is needed when working with the supplied editor source code, to ensure that you do not compromise the IDE or introduce a dependency on a particular release of LispWorks.
In particular please note:
Editor User Guide (Windows version) - 01 Dec 2021 19:35:28