(appt-disp-window-function): Doc fix.
(appt-display-message): Move beep before display. (appt-check): Make interactive. Reduce the number of lets. Use string-equal to compare mode-line strings. (appt-disp-window): Pluralize "minute" as needed. Make appt buffer read-only. (appt-select-lowest-window, appt-make-list): Reduce the number of lets. (appt-delete): Simplify.
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