experience.
1) look at the quantity (if it is different than all the other options then it may be a customer order)
2) look at the spread of the option at the CBOE (if unusally tight then one side is probably a client order)
Not that it matters really who is on the bid/ask but the bottom line is that 95-99% of equity options (whether its a customer order or the DPM's market) on the CBOE should provide auto executions as long as the market isn't locked or crossed.
1) look at the quantity (if it is different than all the other options then it may be a customer order)
2) look at the spread of the option at the CBOE (if unusally tight then one side is probably a client order)
Not that it matters really who is on the bid/ask but the bottom line is that 95-99% of equity options (whether its a customer order or the DPM's market) on the CBOE should provide auto executions as long as the market isn't locked or crossed.