Short answers, pulled from the story.
ReFLEX is a two-way wireless communication protocol introduced by Motorola in 1995. It fundamentally reimagined paging systems by allowing devices to send acknowledgments and data back to the network instead of acting as passive receivers.
The technology was demonstrated to financial analysts on the 19th of January 1995. This event marked a pivotal moment in the commercialization of two-way paging services like Pocket MTEL.
ReFLEX50 uses 50 kHz channel spacing to support high-capacity services while ReFLEX25 uses 25 kHz channel spacing to allow carriers to fit more channels into available spectrum. ReFLEX25 was developed several years after the initial launch to provide a cost-effective upgrade path for existing infrastructure.
ReFLEX 2.7 is a unified standard released by Motorola that merged the ReFLEX25 and ReFLEX50 variants into a single cohesive system. This version introduced critical improvements to roaming capabilities and enhanced interoperability between different network configurations.
The Motorola PageWriter is the first commercial device to fully leverage the capabilities of the ReFLEX network protocol and was released in 1996. It offered the ability to send and receive text messages, emails, and simple data files using synchronous frames and 4-level FSK modulation.
ReFLEX is currently used in Automatic Meter Reading to allow utility companies to remotely read water, gas, and electric meters without physical visits. Public safety organizations also rely on the protocol for low-cost, low-bandwidth machine-to-machine applications to ensure first responders can communicate effectively in remote areas.