Providing computer programs in data networks for electronic point-of-sale systems that generate and issue electronic receipts; providing computer programs in data networks for monitoring and controlling the status of printers, machine tools, and computer peripheral equipment connected to cloud computing networks; providing computer programs in data networks for electronic point-of-sale systems that issue and manage coupons through cloud computing networks; providing computer programs in data networks for sending printing data to printers connected to cloud computing networks; providing computer programs in data networks for managing and controlling the distribution of data to mobile computer terminals and computer peripheral equipment connected to cloud computing networks; monitoring of computer systems by remote access for printers, machine tools, and computer peripheral equipment connected to cloud computing networks