is now documented, and its interface has changed.
In LispWorks 6.0 and earlier
makes multiple calls, one with each selected item. In LispWorks 6.1 and later it makes a single call with a list of the selected items. Existing programs that use
in the subclass
need to be changed. The example in
shows a program that works both before and after this change.
LispWorks Release Notes and Installation Guide - 23 Dec 2011