The Tracer tool is a debugging aid which gives you an interface to the LispWorks trace
facilities. These allow you to follow the execution of particular functions and help you identify where errors occur during execution.
To create a Tracer, choose
Tools > Tracer
or click
in the Podium. Alternatively, a tracer can be created or displayed from within many other tools by choosing the command
Trace > Show in Tracer
in any menu whose commands operate on a traceable symbol.
LispWorks IDE User Guide (Windows version) - 13 Sep 2017