the back office will recieve an overnight list of items going out of date that they need to reduce, a member of staff will locate them and remove them from range, then their hand held system will update at some point and they will be able to print the reduced price stickers, as with all technology, there can be glitches and delays. the items cannot be sold at full price, and they will probably scan through the tills at the updated reduced price, they just need labels on, presumably, if it works the way it does where i work. quite a labour intensive job that has to reply on technology.