Abstract: An order filling system used in an inventory storage area having a controlling computer and a network of user interface devices which each have a microprocessor, memory and the ability to independently process information. The controlling computer coordinates communications with the user interface devices through poll broadcasts. The controlling computer transmits order information to the user interface devices which display the order information to assist workers in picking inventory order items. When the workers pick the specified quantity of an order items they press confirmation buttons on the user interface devices which transmit confirmation signals to the controlling computer. If special processing is required, the user interface device is capable of performing various tasks which reduces the processing requirements of the controlling computer.