The maximum indentation used during output from trace.
The additional amount by which tracing output is indented upon entering a deeper level of nesting.
The stream to which tracing sends its output by default.
The variable that holds the arguments given to the traced function.
The variable that holds the results from the traced function.
The following four variables allow you to control the style of tracing output separately from normal printing:
The value to which *print-circle* is bound during output from trace.
The value to which *print-length* is bound during output from trace.
The value to which *print-level* is bound during output from trace.
The value to which *print-pretty* is bound during output from trace.
LispWorks User Guide and Reference Manual - 13 Feb 2015