yes, tymjr, JTrader must check with the broker your margin limits etc.. because my understanding is, when you talk directly to Globex with FIX this information is not available there. So your program must check ANYWAY your broker, otherwise there is something I don't get.
If not, I guess you could ask for 1000 contracts and I don't see how globex would know you can afford it or not. Actually I remember such an order going through from a firm a few months ago, a typo, the order was supposed to be 'work out' and it went straight sending futures way down on no news no technical no nothing.
At least it was reported that way, we'll never know what really happened. (maybe someone remembers : order origin was Japan who wanted to sell stocks, the firm wanted to hedge with futures but it went full blast instead of slowly accumulating shorts). anyway.
if someone knows more about how JTrader Patsystems can talk direct with Globex, still checking (or not) your account, and what does globex check when being talked from their FIX interface... It is just curiosity because I still see no difference in quotes between IB and CME quotes or eSignal. maybe I am lucky.
of course, I do know there is an internet delay for all 3 (!) to my machine, but it costs so much more to remove that delay anyway (hardware, software etc...).
tntneo