Hi Jeff,
To answer your questions:
1) Yes, you can just use the HST files which are used by MT4 to display charts.
2) Both FXT and HST are generated from the tick data. The HST files contain the bar-level information and FXT more accurate tick-level information.
3) The broker should only add new data to the existing HST information unless you decide to manually download information from the History Center. You should not make the HST files read-only as this will prevent new information from being added to the database.
Please note that we don’t typically support the data in this way since there is obvious contention between the two systems trying to write data to the same files. We welcome any feedback on your experiences that may help others, though!
Regards.
