A symbol representing the name of the system. The system must have been defined using the defsystem macro.
nil or not present then
hardcopy-system works silently. Otherwise a plan of the actions which
hardcopy-system intends to carry out is printed. What happens next depends on the value of simulate:
hardcopy-system 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,
e returns from
hardcopy-system without further processing, and
n work as expected.
LispWorks User Guide and Reference Manual - 20 Sep 2017