Hayes compatible modem: What it means
Hayes compatible modem refers to a de facto standard named after a defunct modem manufacturer. Many software programs advertise compatibility with Hayes modems or Hayes-compatible modems.
Related stories
The article discusses whether there were Windows 3.1 programs so incompatible with Windows 95 that patching them was pointless. It references a "permanently ineligible list" of applications that couldn't be made compatible with the new operating system.