No one can see the other players cards in trading unless the player shows them. Brokers sending IOIs to dark pools releases info to the market. Hitting venue A and then venue B in a serial fashion will release info the market, letting some traders cancel before you get to B.
There is no mechanism on the lit markets for anyone to see an order BEFORE it interacts by either posting to the book or being crossed with another order and generating a trade. Anyone who says otherwise is unfortunately misinformed.
No longer available on lit US equities. A failed experiment by exchanges to compete with internalizers by providing the opportunity for price improvement to those orders who elect to be shown to participants prior to posting or taking.
There is no mechanism on the lit markets for anyone to see an order BEFORE it interacts by either posting to the book or being crossed with another order and generating a trade. Anyone who says otherwise is unfortunately misinformed.