This is a way of forex trading that provides immediate access to interbank market. The interbank market is where foreign currencies are traded. This is different than trading through dealing desks that are found in many banks and financial institutions. By using a dealing desk, a forex broker who is registered as a Futures Commission Merchant (FCM) and Retail Foreign Exchange Dealer (RFED) can offset trades. If no dealing desk system is used, positions are automatically offset and then transmitted directly to the interbank.

Means you are not trading with or in some cases against a dealing desk.