I remember xhtalk; a little program you would configure with a list of hosts and user names, and it would show a small window (which you would place in a conven

I remember xhtalk; a little program you would configure with a list of hosts and user names, and it would show a small window (which you would place in a convenient corner of your screen) where each user name was highlighted when they logged on anywhere (the program would periodically finger each machine and search for your configured user names). If you clicked on a user name, it would start a new terminal with a talk session to that user to the machine where they were logged on. Basically an instant messenger before any others.