Dow Jones Futures


I want to know how to trading done in Dow Jones Futures over night?

I mean Suppose I am based in India and want to trade in Dow Jones Futures, How I can do it ?

Whether I need to log in during US timing or When US people are sleeping I can enter into trade??

If Dow Jones Futures are listed on various exchanges what purpose does it serve to trader based in USA and also a trader based in India.

Whether US based Trader will see same rate of Dow Jones Futures when he gets up and start to trade ??

You sir with due respect should not be trading. Friendly caution. Read up. Best.