Variable: zone-all-frames
zone-all-frames is a customizable variable defined in zone.el.gz.
Value
nil
Documentation
When non-nil, zone in all open frames.
Displays the *zone* buffer in all windows in all frames.
Probably introduced at or before Emacs version 31.1.
Source Code
;; Defined in /usr/src/emacs/lisp/play/zone.el.gz
;;;; Customization flags to control what is zoned
(defcustom zone-all-frames nil
"When non-nil, zone in all open frames.
Displays the `*zone*' buffer in all windows in all frames."
:type 'boolean)