You will need a laptop computer, loaded with CAT ET ( electronic technician) and a CAT Comunications adapter ( I or II) as well as the correct cable to connect to your machine(s). There are 2 ET versions, customer and dealer, of course the customer version will NOT allow as deep access OR allow faults to be cleared. Both require a subscription, and allow access to parts. Service letters, special instructions, and dealer specific info are only available on Dealer ET.
See your Cat dealer for pricing and make sure they detail time for training.