I didn't say anything about BBS software not being multi-node. The difference I'm discussing is between BBS software that required a multi-tasking OS (such as

I didn't say anything about BBS software not being multi-node. The difference I'm discussing is between BBS software that required a multi-tasking OS (such as DESQView, OS/2, or yes AmigaOS) to achieve multi-node, and those that did not. Nearly all BBS software is in the first category. "Multi-node" support just meant the BBS software only knew about file sharing/locking, and how to yield the processor when idle. That's about it. Multi-node with N nodes meant running N copies of the BBS software process. Due to RAM limitations, that often meant you could only get a few nodes per PC. MajorBBS/WorldGroup was in the second category. It implemented its own multi-tasking / event loop, and ran in a single process. It could support a huge number of nodes despite running on DOS, which of course is not a multi-tasking OS.