Keys to Move from Cell to Cell:
or 
Moves one cell Left
or 
Moves one cell Right
Moves one cell Up
Moves one cell Down
Moves Left to start of row, stopping before and after missing values
Moves Right to end of row, stopping before and after missing values
Moves Up to start of column, stopping before and after missing values
Moves Down to end of column, stopping before and after missing values
Moves one Screen Up until the Top is reached
Moves one Screen Down until the Bottom is reached
Moves to the First Column
Moves to the Last Column
Moves to the First Column on First Row
Moves to the Last Column on Last Row