Yes, that is one of the purposes of these machines.
Unfortunately, POS machines are only for point of sale, and as such don't handle online transactions.
Most retailers buy POS machines, but there are a select few who do lease. It all comes down to whether you want to rent or own.
Most POS machines these days can still use phone connections but also accept DSL.
All POS machines are required to have no minumum balances, per VISA, Mastercard and AMEX's merchant agreements.
Point of sale system (POS system)
It's very easy to configure POS machines for frontline, heavy use.
It's a very good idea to have two machines. Visit any retailer and you'll see very few only have one POS machine.
There are inventory control systems that are available for purchase. The system bills the product and updates your inventory at the same time. Walmart uses it. Check out the HP link below.
All POS machines will be roughly the same in this area, so it's largely a matter of preference.
It really depends on your card merchants. Call VISA, MasterCard or AMEX to see which POS machines they suggest.
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Currently there are five major inventory tracking software products that are completely free to businesses and consumers. They are POS Maid, inFlow Inventory Free Edition, ABC Inventory Software, BS1 Enterprise Accounting Free Edition, and Chronos eStock Card Inventory.