Direct access / counterparty visibility

Are there any exchanges where some label or identifier for the counterparty is visible either after the trade or as a detailed order book?

Is it possible to view open orders or recently closed orders of particular brokerages?

Is it legal for a customer to ask, and a broker to answer if that brokerages customers are as a group trading much of one instrument or another?
 
Many US markets have some additional info when you're getting a professional or private feed. They are ala carte additions to the feeds and are very - very expensive. Same for subscribers of some of the dark pools. Hidden size and brokerage info - not customer info.
Where floor brokers still exist, they will be holding a ton of liquidity info and that remains inaccessible.
 
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