A symbol representing the name of the system. The system must have been defined using the defsystem macro.
or not present then
works silently. Otherwise a plan of the actions which
intends to carry out is printed. What happens next depends on the value of
displays each action in the plan one at a time, and asks you if you want to carry out this particular action. The answer executes the rest of the plan without further prompting,
without further processing, and
work as expected.
LispWorks User Guide and Reference Manual - 21 Dec 2011