Variable: calc-display-trail
calc-display-trail is a variable defined in calc.el.gz.
Value
t
Documentation
If non-nil, M-x calc (calc) creates a window to display Calculator trail.
Source Code
;; Defined in /usr/src/emacs/lisp/calc/calc.el.gz
(defcalcmodevar calc-display-trail t
"If non-nil, \\[calc] creates a window to display Calculator trail.")