An alternative to mail is a real-time conversation with another
user. The talk command requests a conversational link to
another user by specifying that user's logonid:
talk <logonid>@<hostname>
You will see a message "Waiting for your party to respond"
as the talk daemon waits for the message recipient to enter the
''talk <yourlogonid>@<yourhostname>'' confirmation string.
Once a connection is established, a horizontally split window
is created which separates your editing space (the top section)
from the recipient's editing space. What you type is displayed
simultaneously on the top of your talk window, and on the bottom
of the recipient's window. To end the conversation, indicate to the
recipient that you are leaving, then enter the interrupt sequence
<ctrl-c> to break the connection.