2. The controller defined in claim 1 wherein each of said sequences is comprised of a plurality of command instructions, each of said command instructions defining an individual step of said sequence and each of said command instructions also being associated with a legend which describes said individual step of said sequence.
3. The controller defined in claim 2 wherein said visual display displays a message associated with an error, said error message including said legend of said sequence and said legend of said command instruction said executing means was attempting to execute when said error occurred.