Looks like the exchange is offering this type of trading on a few commodities. Does anybody know which settlement time is implied by "TAS". Is it the open outcry settlement at 1:30 or the Globex settlement at 5:15? Another concept I am unable to grasp is the TAS plus or minus ticks. For example, you can specify to buy gold at the settlement minus n ticks (or sell at settle + n ticks). Why would everybody not do this if you are guaranteed a fill? However, if the fill is not guaranteed then how is TAS any different from just placing a limit order around the settlement time? And yes, I called and emailed the exchange but she did not know the answer and I got forwarded to some voice mail who never called me back.