Today, there is software that runs on personal computers that does the same thing as a cash register. This is called a point of sale (POS) system and is used by many big stores and restaurants because it is easier to manage a lot of machines from one place. It can also take care of inventory (how much of each item is in the store at any time), so that the shop owner knows when they have to get more items from the supplier to make sure a customer can get the item when they want it. Unlike a traditional cash register, different parts of a POS system are separate hardware rather than built into one machine, which makes it easier to set up. Companies like IBM, Toshiba, and NCR Corporation (which came from the original National Cash Register Company) are just a few of those that make POS systems and hardware, some of which include touchscreens that make it easy to operate.