Never heard about Rob Booker. But if you interested in price action trading, Ichimoku trading & other PA based trading I would like to suggest Chris Capre for you. Because I completed few courses under him. Google 2ndskilesforex. Hopefully you can get to know more about him and there are loads of free articles, videos,analysis & other materials available there.
The broker basically resets the positions and provides either a credit or debit for the interest rate differential between the two currencies in the pairs being held. The trade carries on and the trader doesn't need to deliver or settle the transaction. When the trade is closed the trader realizes their profit or loss based on their original transaction price and the price they closed the trade at. The rollover credits or debits could either add to this gain or detract from it. traders podcast rob booker
Yet curiously, Chapter 3 in Boris and Kathy's book Millionaire Traders (published in 2007) features an interview with none other than the same Mr Booker, the "100 pip trader" ("in less than 5 years, he's gone from being a $2,500 trader to a client of a major bank who trades a respectable size account" -- see p37). Assuming that B&K performed some background research before selecting their interviewees, then being the subject of such a book creates the impression that Rob has in fact made a 7 figure sum from trading. Hence I don't know what to make of it all.