Comment by jhallenworld

In the early years of Linux, before it had networking, we used KA9Q for the TCP/IP stack:

https://www.ka9q.net/code/ka9qnos/

This worked in DOS, but was easily ported to Linux.

As far as DPMI: I used the CWSDPMI client fairly recently because it allows a 32-bit program to work in both DOS and Windows (it auto-disables its own DPMI functions when Windows detected).

https://en.wikipedia.org/wiki/CWSDPMI