9 Downloadable software in the nature of a mobile application for augmented reality (AR), virtual reality (VR), and mixed reality (MR) training on the installation, operation and maintenance of point-of-sale (POS) systems, namely, point-of-sale terminals, bar code readers, optical readers, advertisement display monitors, keyboards, automatic cash drawers, printers, scanners, radio transmitters, radio receivers, computer hardware, and computer operating software