Anyone mind explaining outside RTH and Pre-open trading to me?

I'm a newbie and realize this is rather fundamental.
A.)
From the gist of it, it seems like outside RTH means stocks traded outside the NYSE will keep on trading worldwide in other exchanges, so your broker allows to trade those elsewhere.
B.)
Also seems like not all stocks traded during open market in the NYSE are traded in these other exchanges.
C)
The pre-open seems to allow NYSE traders to get a jump on the official market open time? Does this mean the orders are going through other exchanges much like outside RTH or they are being traded in the NYSE?
D)
What's confusing to me is the timing of some of these stocks differs. I thought pre-open was 7:00 am eastern but noticed XOM started trading at 6:00. What about outside RTH (is that 7:00 pm for some but not all?)
 
Oh, what are you talking about? Nasdaq opens at 4 am too.

You are correct. I was referring to regular trading hours.

NASDAQ Trading Schedule
Regular Trading Session Schedule
The NASDAQ Stock Market Trading Sessions (Eastern Time)

Pre-Market Trading Hours from 4:00 a.m. to 9:30 a.m.
Market Hours from 9:30 a.m. to 4:00 p.m.
After-Market Hours from 4:00 p.m. to 8:00 p.m.
Quote and order-entry from 4:00 a.m. to 8:00 p.m.
Quotes are open and firm from 4:00 a.m. to 8:00 p.m.

http://www.nasdaq.com/about/trading-schedule.aspx#ixzz4SiAupT1U
 
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