Updating of Offline Charts

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Can someone tell me how MT4 updates offline charts?

Is the .hst file associated with that chart updated or is the chart itself updated?

When PostMessageA() is called, what data is it passing to the offline chart?

a. can that data be accessed?

If the chart itself is updated, what data is updated and how would it be accessed from a program?

a. is it in the timeseries... ie. Close, Open etc. ?

or...

is the only way to access to the data - before the update occurs?

I am writing an EA which creates a nonstandard Symbol and nonstandard currency values, then writes them to a custom offline chart file.

I am trying to find out if I can access the chart data as it is updated in realtime from with an indicator on the offline chart, or if I must pass the data via Global variables or some other method from the driver program.

Any help clarifying this would be much appreciated.

Sincerely

Chief