For your reference:

  No, it is much simpler than that.  To bind the function keys, you create a
  keymap.  You also specify that the keymap (a kind of function basically) is
  bound to a certain combination, the prefix keys!  When you bind the
  fnkey keymap to ESC-[, you get rid of the prev para meaning.

  Similarly, You can't bind Ctrl-X to do anything on its own because it is bound
  to a keymap! It could be any combo of keys, it does not have to be M-x or C-c to
  be treated specially!

  Any questions?