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researchv10 Norman

There are two routines implemented: ipcpath and ipcopen.  Both appear to
work pretty much the same as the V10 versions.  ipcpath converts
a destination with default network and service name to a string
useable by ipcopen.  Ipcopen processes destinations with the
following format:

	dialer!destination

The following networks are supported:

	dk  - connect through datakit dkdial(2) call.  Host address
		must be a valid datakit string.

	tcp - connect through a socket.  Host address is obtained
		by gethostbyname.  Format of destination is
		host!service.  If the service name is the form
		tcp.nn or nn, call service nn.  If it is an alphabetic,
		obtain the port number through getservbyname.

	mx - same as tcp, except ask the resolver for MX records
		and try those addresses.  If no MX records work,
		try the A address of the host.

	proxy - connect to the Internet through the gateway proxy
		service whose
		address is given in the ipcopen.c source.  The
		connection may be through datakit or tcp.

	(others)	some synonyms for various proxy destinations.

All the code is contained in a directory named `ipc'.  The command
	make init net1 net2 ... lib
will install code to call the networks requested from the network names
given above.  Uninstalled networks will call a stub that aborts
if the network is tried.

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