A small store works with one workstation, which can be any kind of Mac you like.
Use the networking capabilities to manage your whole store with Checkout.
Congratulations, you probably have the biggest store on the block.
A big store may have workstations in the front, the back, and/or the main office. Checkout's networking capabilities link all your workstations to your store database so you can adjust stock levels from the stock room, access product and customer information from your office, and record sales from any computer.