In the US the owner of the company/employer is required by OSHA to provide training for the functions an operator is to be performed - eg loading/receiving dock, warehousing, production support, etc. These are to be company management supervised in a "simulated enviroment" and not "on the job training" where other employees are present. Accordingly, the type of equipment used can be widely different - counterbalance sit down or stand up, pantograph or mast reach, walkie types, order selectors, turret truck s etc. It is obvious that each of these type "do not" operate on the same principles and training for each needs to be provided. The empoyer needs to keep a file on each operator of the type of equipment that they have been certified to operate and the work enviroment they have been qualifed to work in.

In the end it is the employer that makes the final decision who is granted a certifcate. The forklift dealer can support the training by conduction training class on principles of operation of the various equipment types etc, or provide train the trainer programs or supply training materials

That's the law in a nutshell - in actual practice you'll find employers that do comply and others who do little or nothing or some like to call "risk management"