Administration Using Telnet
(Changed)
By using a Telnet client via the Telnet protocol, you can connect to the SAP NetWeaver Application Server Java (AS Java) and administer it using a predefined set of shell commands.
Communication over Telnet is not encrypted so access to the AS Java over Telnet is limited to host 127.0.0.1 (localhost) for security reasons. You can establish a connection only from the local machine on which the AS Java system is installed and running and which has a Telnet client.
More information: Administration Using Telnet