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(elisp)Special Events

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Special Events
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   Special events are handled at a very low level--as soon as they are
read.  The `read-event' function processes these events itself, and
never returns them.

   Events that are handled in this way do not echo, they are never
grouped into key sequences, and they never appear in the value of
`last-command-event' or `(this-command-keys)'.  They do not discard a
numeric argument, they cannot be unread with `unread-command-events',
they may not appear in a keyboard macro, and they are not recorded in a
keyboard macro while you are defining one.

   These events do, however, appear in `last-input-event' immediately
after they are read, and this is the way for the event's definition to
find the actual event.

   The events types `iconify-frame', `make-frame-visible' and
`delete-frame' are normally handled in this way.  The keymap which
defines how to handle special events--and which events are special--is
in the variable `special-event-map' (Note: Active Keymaps).