Identify every sink control before using an unfamiliar kitchen. A small button beside the tap may operate the disposer, while another fitting may control a separate hot-water appliance or accessory.
What the observation tells you
Guessing by appearance can cause an unexpected motor start or expose someone to hot water. Ask the owner or installer for the operating information and match the appliance labels to the correct manuals. Do not press controls experimentally while hands or utensils are near the drain opening.
A useful next step
Once identified, keep clear household instructions with the manuals. If a control remains ambiguous, leave it unused until a competent person confirms its function.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.