Walker operation: I can only speculate on part of this. On the sink top, between the sink and dishwasher, is a water valve controlling the water flow into the dishwasher. Next to that was a drain plunger, but mine is missing, so I cannot describe it, or its action. The operator would have manually controlled the drain, and amount of water metered into the dishwasher. Likely, the operating instructions would have said to let the hot water valve run for one minute, then close. Kohler dishwasher ads from this same era, mention that the dishes need to be rinsed before loading the dishwasher. Probably a wash of 5 minutes was recommended, followed by opening the drain, and repeating the same steps for two rinses of 1 minute or 2 each.
Mike