From the beginning operator's standpoint, half the battle of learning how to operate a CNC machine is simply knowing when each procedure is required. Then, it will be a simple matter to follow the basic sequence to attain the machine's desired function. For example, if an operator wishes to load a program into the control memory, there are a series of switches and buttons that must be activated in the proper order. If the operator wishes to change an offset, a specific procedure must be followed. While the actual buttons and switches will vary depending on the control model, once the operator has documented the most important sequences, it is relatively easy to make the machine function in the desired manner.