Customizing Appointment Reminders
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You can specify exactly how Emacs reminds you of an appointment, and
how far in advance it begins doing so, by setting these variables:
`appt-message-warning-time'
The time in minutes before an appointment that the reminder
begins. The default is 10 minutes.
`appt-audible'
If this is non-`nil', Emacs rings the terminal bell for
appointment reminders. The default is `t'.
`appt-visible'
If this is non-`nil', Emacs displays the appointment message in
the echo area. The default is `t'.
`appt-display-mode-line'
If this is non-`nil', Emacs displays the number of minutes to the
appointment on the mode line. The default is `t'.
`appt-msg-window'
If this is non-`nil', Emacs displays the appointment message in
another window. The default is `t'.
`appt-disp-window-function'
This variable holds a function to use to create the other window
for the appointment message.
`appt-delete-window-function'
This variable holds a function to use to get rid of the appointment
message window, when its time is up.
`appt-display-duration'
The number of seconds to display an appointment message. The
default is 5 seconds.