Well I got a little more data and that magic 15 lines of code weren't so magical anymore.

Heck, I think
Something I fail to do is to look at these failure signatures and do that one last, deep analysis that might expose something more interesting. I am due to type up here something I did with neural networks a long time ago to illustrate my point, but I don't have time for all the paragraphs I would need.
I had some forex questions:
1. I am still getting historical data from Dukas. When I get to select the data specifications, it asks me if I want to know the bids or the asks. I have been downloading the bids so far. What trouble am I getting into just using the bids? It's my understanding that I should have both to determine the real price I'd get. Or is it really dependent on the broker? Does it not matter at the 1-minute window?
2. Does anybody have some tips on working with Forex in AmiBroker? Their own site shows how to change how a ticker is represented so it properly trades on margin, but it generally looks like forex is pushing it in Amibroker.
3. If I only get EURUSD can I safely assume taking a short position on it is 99.9999% equal to going long USDEUR? At the 1-minute window, I assume all arbitrage has happened already. I was working on a script to invert the information, but it looks like I screwed up something.
4. Is 100:1 margin the common way to trade forex spots?