Session mode and command mode
There are two modes of operation in Telnet Client: Telnet command mode and Telnet session mode. Telnet command mode allows the Telnet terminal to open a connection to a remote host, close a connection to a remote host, display operating parameters, set terminal options, print the status, and quit the program.
Once connected to a remote host, the Telnet client is in Telnet session mode. This mode is the most common. After logging on, users are given a command-prompt session. Users are then able to use character-based applications on any remote computer, running Telnet server, as if they were logged on to the system directly.
Once connected to a host, you can return from session mode to command mode to change terminal settings. You can change from a Telnet session mode to a Telnet command mode by pressing CTRL + ]. Press ENTER to return to the Telnet session mode.
For information about Telnet client and server commands see: Telnet