Some general rules and guidelines for setting up Triggers are:
Triggers will only be used in a scenario if the game creator chooses “Use Map Settings” as the Game Type. Playing a Melee or other game type on a scenario map disables any map-specific Triggers and enables triggers and victory conditions based on the game type. For more information, see the Game Types section.
All Triggers must have at least one Player, one Condition and one Action. The Trigger wizard will not allow you to create an incomplete Trigger.
All Conditions of a Trigger must be met before the Actions are carried out. If you want to have more than one way to activate an event, you must set up multiple Triggers.
Normally, a Trigger can only activate once per game for each owner. Once a Trigger’s Actions have been completed, the Trigger is disabled unless one of the Actions was Preserve Trigger. If you want a Trigger to remain in effect throughout the scenario, include Preserve Trigger in its Action list.
Each player has a separate Trigger list. If a Trigger is applied to more than one player, each player checks its Conditions and executes its Actions independently. Because of this, a Trigger that is owned by “All Players” will carry out its Actions multiple times if its Conditions are true for multiple players.
If a Trigger’s owner is defeated or leaves the game, the Trigger is disabled.
The final player in a scenario must explicitly receive a Victory Action before the scenario will end. If one player executes the Victory Action, all the other players will defeat, but if other players have executed the Defeat Action, the remaining player will not automatically win.
All Text messages, WAV files and Transmissions are only sent to the Trigger’s owners. Text messages will only appear if the owner has Subtitles turned on in the Starcraft Sound Options Menu or if the Always Display option is checked for the Action.
Conditions that are turned off by removing the checkmark next to them are ignored and considered “true.” Use the Never Condition or disable all of its actions if you want to completely disable a Trigger.
Certain Actions are marked as “Blocking” Actions. No other Actions can take place until a Blocking Action is finished. The Blocking Actions are: