The WMS then generates a unique bar code tag ("license plate") to be applied to each carton or pallet received and the goods are staged for putaway. Note that "license-plating" can also be accomplished with RFID tags. The tag number is what the WMS uses to track the specific receipt during its journey through the warehouse. Damaged goods, returns and materials requiring QC are segregated from those to be crossdocked or stored. As check-in and staging for receipts are completed, the WMS immediately tasks operators via radio data terminals to move to the staging area. At staging, an operator scans the bar code (or RFID) "license plate" on a receipt and the WMS determines where it is to be moved.