I don't know if this is what you are thinking of, but there is this concept in embedded systems sometimes refereed to as library operating systems [1]. My under

I don't know if this is what you are thinking of, but there is this concept in embedded systems sometimes refereed to as library operating systems [1]. My understanding is that in this model the operating system is implemented as a library and you your system would consider of one application that uses the os library to do tasks usually handled by the operating system. [1]: https://en.wikipedia.org/wiki/Operating_system#Library https://en.wikipedia.org/wiki/Operating_system#Library