Computer hardware and software systems for point of sale systems comprising software for the operation and control of a point of sale machine, computer monitor, computer printer, and computer peripheral; point of sale terminals; data terminals, namely, mobile data terminals, handheld terminals, countertop terminals, portable terminals; credit card, debit card, loyalty card, magnetic card, smart card and contactless transaction processing terminals for electronic transactions; downloadable software in the nature of a commerce enabled software application for use with point of sale terminals and data terminals; computer hardware and software for merchant management and order fulfillment; computer hardware and software for employee management; computer hardware and software for inventory management