This article talks about named pipes.
So, it seems posslble to populate a chart with data.
I was thinking that MT4 could read from itself and place data into a new chart and symbol
i.e. GBPUSD ---> GBPUSDTMP
If this were done starting from the start date and looped to the enddate then, if placing some trigger at the end of your code + wait a fraction - OnTick() would fire.
So perhaps it is possible - from the IDE - to get it all working and thus debug with historical data.
i.e. Ontimer() fires but now looks for a flag that indicates you have reached the end of the code - and so signals a new tick.
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