Thank you very much Ollie. That helps a lot, I will examine the plugins carefully to see if any of them can be used in my line of work. I have fairly specialized technical needs. I can do some minor coding but I just don't have time for major work. I like the fact that it is a system that I can use freely in courses that I teach in language and technology - although it was a bit problematic to install on my (windows 10) laptop. I had to do a manual upgrade to get the system to work. Maybe I should try and put on my linux server - except installing MongoDB there is a big deal and not guaranteed to succeed (at least not for me).

Thanks again and cheers

Andrew