I still have that Algol68-R User's Guide on my shelf and remember to this day the excitement that gripped me when I learned from it about REFs. I went on to imp

I still have that Algol68-R User's Guide on my shelf and remember to this day the excitement that gripped me when I learned from it about REFs. I went on to implement my final year project in it, which was considered by all concerned to be a crazily risky thing to do. The only thing that matched it for excitement was connecting for the first time to a "live" remote computer through a teletype and that thing actually typing things back at me.