[ic] Removing INET mode

[Scot Wilcoxon]

Mike's comment:
 > In addition, we recommend that if you don't need INET mode that
 > you disable it. In addition it would be wise to close port 7786
 > on the internet side of your firewall.

I haven't seen it stated, but I think the "INET" reference means "set 
Inet_Mode to No in /etc/interchange.cfg or similar files."  But perhaps 
there is something else called "INET" buried where I haven't yet found it.

"INET" is a convenient shorthand phrase to use among developers, but not 
when issuing configuration instructions to all users.

(I am aware there can be several such files in one computer and 
"interchange.cfg" is just the distributed example)