I want Companies or Software, or both, that allow instant trading i.e.
the buying and selling of stocks, (equities), on the US markets
(NASDAQ / NYSE),  in "real time". This software, (or Company
stockbroker platform or
membership), needs to be able for me to trade the US stocks FROM THE
UK. I currently have an account with TD Waterhouse and trade via an
internet based system into and through TD Waterhouse. This takes too
long and I wanted to trade with the same advantages that traders trade
with in the US where the stock trades are almost immediate, where one
gets an "executed trade" result back in approx five seconds rather
than a few minutes sometimes using TD Waterhouse. Thank you.