SET(PRE_KEY_PROCEDURE)

  Specifies a procedure to be executed before execution of the program or
  learn sequence bound to a defined key.

  Syntax

     SET (PRE_KEY_PROCEDURE, keymap_list_name,
          [program | buffer | range | string | learn])

  Parameters

     keymap_list_name     A string specifying the keymap list for which you
                          want the procedure to be called.

     program              The program to be compiled, if necessary, and
                          executed when a define key is pressed.  If you do
                          not specify this parameter, the previously defined
                          program is deleted.

     buffer               The buffer containing DECTPU statements to be
                          compiled, if necessary, and executed when a
                          defined key is pressed.  If you do not specify
                          this parameter, the previously defined program is
                          deleted.

     range                The range containing DECTPU statements to be
                          compiled, if necessary, and executed when a
                          defined key is pressed.  If you do not specify
                          this parameter, the previously defined program is
                          deleted.

     string               The string containing DECTPU statements to be
                          compiled, if necessary, and executed when a
                          defined key is pressed.  If you do not specify
                          this parameter, the previously defined program is
                          deleted.

     learn                The learn sequence to be replayed when an
                          appropriate key is pressed.  If you do not specify
                          this parameter, the previously defined program is
                          deleted.

  Example

  The following code displays a message before the code bound to a key is
  executed:

     SET (PRE_KEY_PROCEDURE, "tpu$key_map_list",
         'MESSAGE ("Executing Key " + GET_INFO (LAST_KEY, "name"))');