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In Services, how can we know if some EA is attached to a chart or not.

Hi All, I have a Service which is running an infinite loop. I want to check if my EA is attached to a chart or not. I can loop through opened charts , but not able to find a function which can tell me is any EA is attached to the specific chart id or not. Is there a way to find out if any of my EA

L1 and L2 data in Services

Hi All, I am developing a new program to get data (L1 or ticks data, L2 or Market depth data, History data etc) of multiple symbols. I want to use Services so that I am not dependent on a chart and user does not have to place it on all charts. Problem i am facing is that OnTick and OnBookEvent are