When talk is invoked, the screen of the originator is split into two equal parts (a horizontal line of hyphens separates the two parts). user_b receives a request to answer:
Message from Talk_Daemonneon at 9:59 ...
talk: connection requested by smithneon.sao.nrc.ca.
talk: respond with: talk smithnickel.sao.nrc.ca
Once user_b, in this case smithneon, responds to cantinnickel, his screen will be split in two: the top portion of the screen always displays the local user's messages, and the bottom portion the remote user's message. Characters are displayed as they are typed.
To close the connection, press CTL-C.
As with finger, many systems do not allow non-local systems to use the talk facility on the local system.