Most foreign exchange dealers are banks, so this behind-the-scenes market is sometimes called the interbank market, although a few insurance companies and other kinds of financial firms are involved.
The money was channeled to a foreign exchange dealer and transferred to accounts at other banks and to local casinos before being moved out of the country.
For example, the arcane language of foreign exchange dealers developed in order that they could deal quickly and exchange nuanced information about the trustworthiness of their peers.