Back in the stone ages, when men were men and women were women and Unix's competitor was VMS, Unix had a lovely talk (or ntalk, or ytalk) split screen IM command where you could talk and both parties could see what was being typed character by character, live (modulo netlag).
No newer IM program I am aware of offers more than a throbber indicating the other party is typing.
Are there any successor IM's that work like the older talk/ytalk/ntalk family? My understanding is that now they are hard to get working at all and deprecated as suffering chronic buffer overflow vulnerabilities. But the basic functionality they offered has something I have not seen in any IM I know of.
If there is not a successor, is there a way to get one of those family working on a Linux or NetBSD box so that users who have shell accounts and are logged in can talk via a command line login session?