On December 10, the Securities and Exchange Commission approved a proposed rule change by the Chicago Board Options Exchange to establish a “Voluntary Professional” designation. This designation permits non-broker-dealer customers to voluntarily have their orders processed similarly to broker-dealer orders for order handling, order execution and cancel fee calculation purposes.  

http://www.cboe.org/publish/InfoCir/IC08-199.pdf  

http://www.cboe.org/publish/InfoCir/IC08-203.pdf