SYNTAX            : RANGE ;I ANY ESC ESC
7.1               : RANGE ;I             (for negative first value)

RESULTING ARGUMENT: None

FUNCTION          : Replace any normal key-action with a macro, much like a function
                    key definition, but separate for the various modes.

RANGE             : MODE,CHAR
                    MODE          : the mode(s) for which the change must be made.
                                    Replacements can be set for command-mode, overstrike-mode
                                    and insert-mode seprately - or combined. It is a matter of
                                    combining the values representing each mode (as defined for
                                    the CTRL_X-command). So a change for just command-mode would
                                    need a value of 31, and for (for instance) both overstrike-
                                    and insert mode a value of 32 + 33 = 65. Similarly, for all
                                    modes at once, 31 + 32 + 33 = 96 can be used
                    7.1             Instead of the positive numbers above, negative numbers can
                                    be used to undo a redefinition. In that case, the syntax
                                    reverts to its second form (no character follows ;I).
                                    If no redefinition is active when trying to undefine a key,
                                    no error is reported; this situation is silently ignored.
                    CHAR          : key to redefine or (7.1) undo.

EXAMPLE           : 65,'a' ;I :m Press CTRL_C to abort ESC
                    Will cause 'a', when typing in both insert- and overstrike mode, to no
                    longer be echoed; only an informational message is displayed. This is
                    undone by: -65,'a' ;I

NOTE 1            : As soon as any definition becomes active in either insert- or overstrike-
                    mode, no backup-filee journaling is possible. A message is issued warning
                    about this when it happens.

NOTE 2            : Control-keys and function-keys cannot be redefined in this way.

NOTE 3            : Only one level of translation is done (if 'A' is defined to yield 'C'
                    and 'B' is defined to yield 'A', pressing 'B' will return an 'A' and
                    not a 'C').
MATRIX