Points of sale (POS) systems are electronic systems that provide businesses with the capability to retain and analyze a wide variety of inventory and transaction data on a continuous basis. POS systems have been touted as valuable tools for a wide variety of business purposes, including refining target marketing strategies; tracking supplier purchases; determining customer purchasing patterns; analyzing sales (on a daily, monthly, or annual basis) of each inventory item, department, or supplier; and creating reports for use in making purchases, reorders, etc. Basic point of sale systems currently in use includes standalone electronic cash registers, also known as ECRs; ECR-based network systems; and controller-based systems. All function essentially as sales and cash management tools, but each has features that are unique.