By default, the arrow keys function as editing keys to provide command
  line recall and line editing.  The SET FUNCTION command redefines the
  function of the arrow keys on the terminal to one of three additional
  functions: PAN, SCROLL or MOVE. For example, by entering the SET FUNCTION
  PAN command, the left arrow, right arrow, up arrow, and down arrow keys,
  are defined as PAN LEFT 1, PAN RIGHT 1, PAN UP 1, and PAN DOWN 1.

  The SET FUNCTION SCROLL and SET FUNCTION MOVE commands redefine the
  arrow keys in a similar manner.  Command line recall and line editing
  can be restored by entering the SET FUNCTION EDIT command.

  Format:  SET FUNCTION function-name

  Note: The SET FUNCTION MOVE command implicitly turns auto-positioning off.