and as for the interaction
the process is abysmal, firstly having to start again and painstakingly put in the location from scratch, then once the new ob is created - how to link it with the first ob?
The wording to describe the interaction is not helpful, which ob is doing what to who?
then to enter the interacting ob - ok there's a space so copy in URL -WRONG, there's no prompt but what they actually want is for one to click in the empty bar - so obvious! which I did more or less by accident, I think I was just thumping my keyboard in frustration and low and behold a list of obs appeared, presumably anything that had been posted within 20m of my first ob