Short answers, pulled from the story.
Motorola developed ReFLEX as a wireless protocol for two-way paging and low-bandwidth data. The system emerged from the earlier FLEX one-way paging protocol to add capabilities for multiple forward channels, multiple return channels, and roaming.
Destineer Corp demonstrated this two-way messaging technology to financial analysts on the 19th of January 1995. This event occurred before ReFLEX25 arrived several years later to provide an upgrade path for traditional one-way paging carriers.
Forward channel speeds reach 1600 bits per second, 3200 bits per second, or 6400 bits per second. These speeds rely on 4-level FSK modulation within synchronous frame structures based on 1.875 second frames.
The Motorola PageWriter device entered the market in 1996 as a primary hardware implementation of the ReFLEX network protocol. It was among the first devices to utilize this specific two-way paging technology to allow users to send messages back through the same network that delivered them.
Version 2.7 merged the previous variants into a single backward-compatible standard released simply as ReFLEX 2.7. Devices compliant with this version work seamlessly on both ReFLEX25 and ReFLEX50 networks while introducing new features to improve roaming between different networks.
ReFLEX now has limited viability in the commercial consumer messaging market but found new uses in Automatic Meter Reading applications instead. Public safety organizations adopted the system for specialized low-cost data transmission needs, and M2M applications requiring minimal bandwidth also embraced the protocol.