Questions for a better trading system?

Hi everibody i wanna do some question about trading sistems improvements:

1) Do you think forex can be correlated to other markets? if yes which pair and which market? (DJ S&P...)

2) Do you use EA to back test your strategies? do you think that is enough affordable?

3) Does exists an EA that can send SMS to your mobile at certain prices?

4) Do you think statistically exist better days to buy or sell?

5) how do you measure the possible begining of a trend do you use ATR, volumes ecc... ( i know this is 1 million dollar question!)

I know that over the forum i can find those informations, i just would place it all togheter, or to have some hint to find the best threads on the forum taking about those subjects!

1. Yes, it correlates to the dollar index pretty well. And quite a few other things correlate to the dollar index (oil, gold, DJI, S&P, some days forex looks like a mirror of the DJ).

2. Usually to get an idea about how to improve it and to look for weaknesses, yes. But I don't use EAs to trade since they are unpredictable in a whippy market.

3. There exist services that convert email to SMS. So you could use the email function to send an SMS.

4. Of course. Monday thru Thrusday, minus big news days and holidays.

5. When price is making higher lows... it's up. Lower highs, down.