Cool.  I will seek out ipnetrouter.  Thank you.  There's a problem with MacTCP and AppleShare simultaneously working on the SE... I don't have an explanation.  But the server does not show up in Chooser if MacTCP is in the System folder and does when it is not.  So I'm not sure if MacTCP is working properly.  I tried LocalTalk Bridge, which hasn't been working (at least with configuring the 7100 as the Gateway etc and choosing a random IP (192.168.1.240) - Elfen was trying to help me with this).  So I'm looking for something other than LocalTalk bridge, but that may not be the issue.

That notwithstanding, now I'm kind of interested in acquiring a copy of this fabled software, though.