1. A method of training a machine tool trainee to operate a computer controlled machine, while the machine is in an operational mode, the method comprising the steps of: inputting predetermined operations data into a memory medium, the operations data being representative of the operational steps useful to properly perform a specified task; comparing the predetermined operations data to trainee operator input data to determine whether the trainee is entering appropriate commands to perform the specified task; disabling the trainee operation of the machine tool upon determination that the operator input data deviates from the predetermined operations data beyond a predetermined tolerance; and generating an error signal to advise the trainee that the operator input data is in error when the operator input data deviates from the predetermined operations data beyond the predetermined tolerance.