Remote command execution can be made to work over successive links by arranging for each job in the chain to submit the next one. There is no facility at the transport level for routing beyond adjacent systems or for error acknowledgement. There has never been any remote login facility associated with UUCP, though the cu and tip programs are sometimes used over the same telephone links. The UUCP mail network connects a very diverse set of machines and users. Most of the host machines run the UNIX operating system.
Mail is the only service provided throughout the network.
Nonetheless, it is extremely popular and still growing rapidly. Also, for low-traffic discussions mailing lists are more economical, since traffic can be directed to individuals according to their specific interests. There is no central administration. To connect to the network, one need only find one machine that will agree to be a neighbor. For people at other hosts to be able to find your host, however, it is good to be registered in the UUCP map, which is kept by the group of volunteers known as the UUCP Project.