Thanks for the link it is helpfull.
As I mentioned I am a new investor so I am not sure what you meant by
this "Using the Google graph for 1 day it is instructive to see prices
that
match the volume through the day.  You then realize that the
candlestick charts give a misleading picture when stray trades occur"
Can you elaborate on this in layman's terms please.  Like I said the
last trade for today was a large sell  see -
http://www.marketwatch.com/tools/quotes/intchart.asp?submitted=true&i...
- yet the share price did not drop as a result - how is this
explained?

I agree that ATS volume is normally low but as I said these last few
days it has been higher than twice the normal -  it seems as if
something is taking place but I can not find any new news.

Was I somewhat correct in my analysis of how a stock price moves?
If it is not a result of supply and demand with ATS than what does
drive the daily price up or down?  I was under the impression the
supply and demand theory applies to all stocks regardless of trading
volume