I'm pretty sure C/PM 86 was already a thing. I believe there was even Concurrent CP/M 86, which let you run up to 4 (or more?) virtual sessions concurrently. Light years ahead of MS-DOS but nobody wanted it, so DRI dumbed it down and added MS-DOS compatibility and re-released as DR-DOS (still superior to MS-DOS though).
Wasn't that abbreviation from "pipe"? As in - this is a pipe that you can use to connect terminal to a file, file to a printer... and yes, file to a file (that's cp/copy).
https://en.wikipedia.org/wiki/Peripheral_Interchange_Program
Looks good!
An order of magnitude (or two!) less code complexity and less memory hungry than most of 2026's bloated Operating Systems...
Well done!