http://prelaunchx.com/x/dole77
How does it work?  As an example, if you expected that the Euro would gain value 
against the U.S. Dollar, you may buy Euros in exchange for U.S. Dollars. 
To do this you would place a buy order on the EUR/USD currency pair. 
Then, if the exchange rate moved as you expected, you could then close your transaction, 
which would exchange the Euros you purchased back into U.S. Dollars 
at the new higher exchange rate. In this case, you would earn a net profit. 
This type of transaction is called “going long”.