^^^Wot he said^^^

Additionally, you did not aim you merely turned and fired, aiming was seen to be unsporting.

They were made to point naturally like an extension of your hand and the trigger was usually very light. The pistols were matched so that both behaved and handled the same, this giving an advantage to the owner as the light trigger would be unexpected and often result in an ND in the hands of his opponent. When familiar with the pistol though they could be quite effective.

I suppose in many ways they are the forerunner to the target pistol.

Ian Hogg has some good bits about duelling pistols in some of his books, the complete handgun has a section on duelling and individual details of many pistols from the era.