And, while I'm still struggling to grasp this stuff - I'm also trying to understand the "direction" of whatever the actual meanings are.

Or in other words - in my brain, I see a "trade" as being something that TWO people engage in (a seller, and a buyer), which probably accounts for my inability to understand why trades have only one designation applied to them (e.g. why are all these trades recorded from the point of view of only one side of the transaction?  Is there a second matching transaction for everything (and if so - how do I find it?, or if not, why not?  and how do they pick *which* one (buyer/seller) to use?)