USRobotics NETServer/8 - Manual (Page 211)

Command Reference 10-61
Netdata Unlike Telnet, Rlogin and PortMux, Netdata is not
actually a login service. Netdata is a direct (clear
TCP) connection to a given TCP port number. 8-bit
data is exchanged without interpretation. Such
connections may be used by dial in applications
that require a socket interface.