Unix have all kinds of funny things if all happens within a single box.
If you want to send someone a message, there is write (if the person have mesg set to yes). There is also talk, but it requires its own daemon.
Seriously, _nix started out in the mainframe era. Meaning that the basic assumption was multiple terminals hooked up to a single computer, with a different user on each terminal.
Sadly we have a generation or more that grew up with single user computers, and seems to insist on turning _nix into that rather than embrace what it can offer.
If you want to send someone a message, there is write (if the person have mesg set to yes). There is also talk, but it requires its own daemon.
Seriously, _nix started out in the mainframe era. Meaning that the basic assumption was multiple terminals hooked up to a single computer, with a different user on each terminal.
Sadly we have a generation or more that grew up with single user computers, and seems to insist on turning _nix into that rather than embrace what it can offer.