You fill the bean hopper, grind your coffee beans, then drop your coffee particles into a point of the collection while using a burr coffee grinder. Non-dosing burr grinders will discharge the coffee into a see-through dish or canister.
A dosing grinder will dispense your grounds into a little sub-divided dish containing shots of coffee beans, which are measured in grams. As a result, you just collect enough shots for your chosen drink when you yank the door handle.