Figure 1

                       +----------+
                       | Keypress |
                       +----+-----+
                            |
                            | keycode
                            |
                +-----------+------------+
                |                        |
                V                        V
        +--------------+        +-----------------+
        | Linux kernel |        | X Window System |
        +-------+------+        +--------+--------+
                |                        |
                |                        | keysym
                |                        |
                |            +-----------+---------+
                |            |           |         |
                |            V           |         |
                |        +-------+       |         |
                |        | xterm |       |         |
                |        +---+---+       |         |
                |            |           |         |
                +------------+           |         |
                |                        |         |
                | character              |         V
                |                        |   +----------+
  +------+------+---------------+ +------+   | netscape |
  |      |      |               | |          +-----+----+
  V      |      V               V V                |
+------+ | +------+  +=======+---+-------------+   |
| less | | | bash |  | emacs |   :             |   |
+-+----+ | +----+-+  +=======+   : input event |   |
  |      V      |    |           V             |   |
  | +---------+ |    |  +------------------+   |   |
  | | minicom | |    |  | function-key-map |   |   |
  | +----+----+ |    |  +--------+---------+   |   |
  |      |      |    |           |             |   |
  |      |      |    |           | input event |   |
  |      |      |    |           V             |   |
  |      |      |    | +---------------------+ |   |
  |      |      |    | | key-translation-map | |   |
  |      |      |    | +---------+-----------+ |   |
  |      |      |    |           :             |   |
  |      |      |    |           : input event |   |
  |      |      |    |           V             |   |
  |      |      |    |     +------------+      |   |
  |      |      |    |     | global-map |      |   |
  |      |      |    +-----+-----+------+------+   |
  |      |      |                |                 |
  +------+------+-----------+----+-----------------+
                            |
                            | command
                            V
                       +--------+
                       | Action |
                       +--------+