Each schedule can have as many actions associated with it as you like. The actions will run in the order they appear in the list at the scheduled times. A Schedule is a user-specified list of actions that are to be performed in a prescribed sequence at a prescribed time or times. Periodic schedules run at some periodic interval within the trading hours of a particular trading session. The interval is user-specified as some number of seconds, minutes, or hours.
Periodic schedules begin running at a user specified starting time.
This starting time can be any valid time within the trading hours of the particular session for the schedule. In other words the first run-time of a schedule can be at the open of the session or any valid time within the session trading hours. One, two, or three fixed times can be specified for each schedule. Each schedule can have one or more actions. Backtest a particular trading system.