how to read real fx balance question

I trade with IB. When I'm flat, I still have a real fx balance. Some of them are positive and some are negative. It costs $2.50 to close them and I will just borrow it again anyway. How do I read what the real fx balance means. If it's negative what does that mean? If it's positive what does that mean?
 
Quote from trading spaces:

If you are not going to trade that currency again then get it as close to zero as possible and it will disappear.
nah, it's mostly CHF which I trade all the time.
 
for instance I'm flat, and I have a 9k CHF positive balance and a 3k JPY negative balance. I'm guessing that is USD because 3k JPY might not even by me a beer in Tokyo.

So what does that mean? How will I be affected when either CHF or JPY moves?

What about interest?
 
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