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• In Scripts/Functions: The given arguments that were passed by a call, exec, execVM or spawn.
  For the arguments in scripts executed by mission-made actions or Event Handlers, check addAction and Event Handlers.
• In Addons' config files: An array with the current object as its first (and only) element.
• In Addons' custom UserActions: Unit that is activating the action.
• In Dialogs: An array with the current control as its first (and only) element (only available during runtime).

this

• In Addons' config files (e.g. UserActions, onInit, etc.): The object the entry belongs to.
• In Dialogs: The player unit that activated control (e.g. via mouseEnter). false if non-activated.
• In Object's "Init" line: The object the init line belongs to.
• In Triggers
  • "Condition" line: The Boolean return value of the trigger's conditions (e.g. "East Not Present" etc).
  • "On Activation/Deactivation" line: Seems to always return false.
• In Waypoints
  • "Condition" or "On Activation/Deactivation" line: The group leader that completed the respective waypoint (or driver, if waypoint is assigned to a vehicle).

thislist

• In Triggers ("Condition" or "On Activation/Deactivation" line): An Array of objects that are currently fulfilling the trigger's condition (same as the what is returned by the list command).
• In Waypoints ("Condition" or "On Activation" line): An Array containing all group members that completed the respective waypoint.
  (thislist in a trigger's deactivation field seems to be undefined, and should not be used. It will either return an empty array, or possibly the contents of a different trigger.)

See Also

All About "This" Detailed tutorial explaining all of the above.