chat.tar.Z - chat Chat with up to 10 users

phone.tar.Z - phone communicate with other users in real-time

rsend.tar.Z - rsend send a message to another (possibly remote) user

sys5-phone.tar.Z - sys5-phone phone another user

talk.tar.Z - talk a set of patches that will enhance 4.3BSD talk(1)

talker.tar.Z - talker example processes communicating over pipes

unaxcess.tar.Z - unaxcess the Unix multi-user conferencing system