Most of emacs is miraculously self-documenting but I found a bare-spot: how to customize emacs notifications. In particular, being an exwm user the in-emacs mini-buffer with Dunst, I hope. There’s a dirth of documentation on the appointment variables/functions, although they are emacs-general. In particular, the key to making this whole thing work, appt-disp-window-function, has no help entry in my emacs, but this does it on my Linux:

Solution Code

(setq appt-display-format 'window)

(setq appt-disp-window-function (function tsa/appt-disp-window))
(defun tsa/appt-disp-window (min-to-app new-time msg)
  (save-window-excursion
    (shell-command
     (concat
      "notify-send \"Orgmode: " msg "\"") nil nil)))

Resources

• Relevant source: https://www.reddit.com/r/orgmode/comments/fg1im8/calendar_notifications_on_windows_10/
• Dunst notifications: https://github.com/dunst-project/dunst#start-of-content