INITRUN
Initial run of the simulation before the price data is loaded and before the log file is opened. Can be used to initialize global and static variables. System variables that are not yet known - f.i. variables that depend on the asset and simulation period - are at 0 during the initial run.
FIRSTRUN
First run of the simulation with valid price data and system variables. Normally follows the INITRUN.
FIRSTINITRUN
First initial run of the script, in the case of multiple simulation runs due to training or Cycles. While INITRUN and FIRSTRUN is set at the start of any simulation run, FIRSTINITRUN is only set at the really first run.
EXITRUN
Last run of the simulation. All trades are closed. Can be used to calculate results, aside from the evaluate or objective functions.