There are some little bits in the public V7 source code that suggest that it had support for Datakit, but that it was scrubbed from the public release: There is a Datakit header file: http://minnie.tuhs.org/cgi-bin/utree.pl?file=V7/usr/include/dk.h and Datakit state bits are defined in 'sys/tty.h': http://minnie.tuhs.org/cgi-bin/utree.pl?file=V7/usr/include/sys/tty.h Does anyone know if this assumption (Datakit support in V7) is correct? Perhaps more specific, was there a remote login program for V7/Datakit, of for V6/Spider? For V8/Datakit there was 'dcon', but perhaps this was built on earlier programs. (I'm aware of 'cu' of course, but that does not support Datakit or Spider). Being able to login to another host on the network seems so useful that it is hard to believe that a precursor to 'dcon' did not exist for V6 and/or V7.