Terminal chat program? Chat with other users currently logged onto the system?

So I will be having a few users longed onto my linux box via ssh using putty. Are there any programs where I could run the

Code:

who

command see another account logged on and chat with that user directly. Just wondering

 

Take a look at

Code:

man wall

 

Wall is a neat program but I was looking for more of a chat program then a announcement one. Anyways after some more searching I found ytalk
http://linux.die.net/man/1/ytalk
http://www.iagora.com/~espel/ytalk/ytalk.html

Its exactly what I was looking for, the only problem is that it won't send any accept requests to other users who are logged on like it should. For example I type

Code:

ytalk [email protected]

and the user testuser never gets the accept request.