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As soon as the OpenSSH client (ssh) has successfully authenticated itself a dialog begins for preparing the OpenSSH session. At this point the client can, for example, request the following activities:
Setup of a pseudo-tty
Forwarding of TCP/IP connections
Forwarding of the connection to an authentication agent (ssh-agent, see "ssh-agent - Authentication agent") via a secure channel
Finally ssh requests either a shell or execution of a command. Client and server are in session mode. In this mode each side can send data at any time. This data is then forwarded as follows:
from the user terminal on the client side to the shell / command on the server side, or
from the shell / command on the server side to the user terminal on the client side.