That's something that's always confused me: Given the prevalence of EMM386 included with later versions of MS-DOS, just how important/relevant were these things?
Good stuff!
DESQview stands out to me, seems to have been the king of multi-node DOS BBS multitasking.
The package I'm running, Ezycom, has explicit support for it. My Win32 "telnet to FOSSIL" bridge emulates it for the ntvdm session, too.