cons : Connection Oriented Network Service 


all/ :	common parts for cons (interface and implementation classes)
	There are two types of classes available.  "Net" is a virtual
	network layer. "NetTCP" is a derived class from "Net" that
	also implements a Network layer onto of Berkley TCP/IP
	sockets (read RFC 1006).  The interface (service primitives
	and pdus look the same in both cases).


demo/ :	executables for both the virtual network (demo) and
	a real TCP/IP subnetwork (demo_tcp).  Note they
	are similar except for .str files and what is put
	into scheduler input queue.

