Ray asked if Nucleus had TrackBack and it does in the form of a plug-in which I had installed, but hasn’t made it visible in the UI so people could actually use it. The main reason for this was I didn’t really understand it. Still not sure exactly how it works, but I now understand enough to make it available.
The count of TrackBack and the URL to use are in the same part of the message with the comment links and time etc at the end of the message. If you click the Link..um Link you’ll see just the message and its TrackBack pings are listed before the comments.
The author of Kung-Log wrote me email and said pinging for Nucleus is on his to-do list now so soon I will be able to use it as well and have it.