"relate"

From Wiki001

The "relate" special token can be used for characters, vehicles, turrets/cameras and items. This is used to refer to the object that caused the action in a trigger. For example, if a character is being talked to, the character "relate" will be the one that's attempting to talk. Relate is often used when several characters is involved in a script where no certain characters is used. If there is only a single character related in the script and the relate is used, it uses the most related character, of course, that single person. A good way to check is the relate is useful is to make sure 2 unidentified characters is involved in a script. Often "this" and "relate", and by checking the name of the window. If you see "relate", this proves the "relate" is used in the script.