There are a number of options available when using the trace facilities, which allow you both to restrict or expand upon the information printed during a trace. For instance, you can restrict tracing of a function to a particular process, or specify additional actions to be taken on function call entry and exit.
Note that the options and values available only apply to a particular traced function. Each traced function has its own, independent, set of options.
This section describes the options that are available. Each option can be set as described above.
LispWorks User Guide and Reference Manual - 21 Dec 2011