Thanks for your reply.
What you're describing is different conceptually to what the indy currently does, at least from a design/programming standpoint. It could be coded, just like anything else, but I'm not attempting anything too time-consuming or complex since the MQL4 programming language underwent change in build 600. Also, I'm deeply immersed in a course on FA at the moment; want to get my money's worth for my two month registration, amongst other things. And trying to spend some time with family over Xmas.
Also, I recall that there was something of a rigmarole involved in setting up Oanda's MT4 (some kind of pre-registration process, like sending them two forms of ID authenticated by a lawyer, just to open a demo account....... that's if I recall correctly), and without going through that process again to set their MT4 up, I wouldn't be able to do any testing, unless we can somehow find another MT4 br0ker who provides the same indices.
Hence I think I'll have to pass on this one.
My apologies,
David