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Answer:
You can't. Most of the transactions in the interbank market are anonymous and unless you know someone on the inside who could give you this information, you have no way of knowing.
In the retail market, your best bet is this thing call the "order flow". The order flow allows you to see the number of long/short positions in the market at a certain given time. I must warn you though that this is DOESN'T provide a complete picture of the market at all because the sample size is so small!
