In [Trade] mode, price history covering the LookBack duration is downloaded from the server immediately before trading starts. Due to weekends and market hours, the lookback duration is normally longer than LookBack * BarPeriod. The downloaded history usually exceeds the lookback duration by a safety margin, but does not exceed 1 year. A longer lookback duration requires the PRELOAD flag and available price history. A too long lookback period will be indicated with a warning message.