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Thanks adwolf1, I found it, from 2011. There were a couple of developers working on it for XF v1.1.x

[USER=888]@Dao Hoang Son[/USER] and ragtek

https://xenforo.com/community/threads/who-has-read-a-thread.14909/

https://xenforo.com/community/threads/ragtek-thread-reader-who-has-read-the-thread.11147/

I will have a look at the code and see if I can tweak it to do what i want it to do