Yes I agree you can't have 2 Z12s running at same time from same Zorro folder. I make a Zorro copy for each system I intend to run. Same view on the sub accounts. You run a risk with two Zorro's against the same account. Every night pretty much I check quick to make sure Zorro and account are in synch - especially loosers! Fact of trading life I think. It would be too hard if trades inter-mingled from dif systems.