GRADE-DIR : FLAGGRADE-DIR is a flag or parameter.
Name of the directory in which the grader files are to be found,
or "" for the directory from which grader was started. This name should
end with a backslash, as in : "/usr/teacher/course-grades/".
When this flag is changed, all of the other filenames will change with it.
Note that in old versions of CMU lisp, the "" option will not work properly.
GRADE-DIR takes values of type STRING.
It belongs to subjects GR-FILENAMES .
Its default value is ""
Its current value is "".
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