There is no such command

1MS - Backwards Character.
  This command will move backwards over characters. It will treat a
  line  break as a single character and move back over it.

2MS Forwards Character.
 This command will move forwards over characters. It will treat a line
 break as a single character and move forwards over it.

3MS - Previous Line.
 This command will move to the same column in the previous line.
 If the previous line is shorter, it will move to the end instead.

4MS - Next Line.
  This command will move to the same column in the next line.
  If the next line is shorter, it will move to the end instead.


5MS A function  Key Command of some sort. No more help for now..