OK this is going to be a really silly question. I have been reading these posts everyday for quite sometime now, and waiting for the light bulb to go off about all the different numbers for these machines. (Bulb has not gone off) So with my head hung low, can someone explain where the numbers come from. Example: 201-2, 99, 66-1 ect. How do you know the number and not just the name of the machine? Can someone enlighten this old brain so I can understand what everyone is talking about!!!