This is backwards compatible with anything you may already have made.
By default all preexisting triggers are now considered absolute. That meaning that they don't care about what person is being injected. They will always run with the given parameters.
Now there is a new category of trigger called relative triggers. Regardless of what the Target Atom is set to in a relative trigger, it will try to apply the same thing to the same receiver, target, and effect, but it will replace the Target Atom with the injected Person.
This allows for changing things like clothing and such without having to only use it on one Atom. The injected Person must have the targeted receiver or it will simply do nothing.
For your convenience, there are now 2 screens for Absolute and Relative Triggers with buttons in the main UI. The Trigger UI's now have text on the top right showing which type of triggers you are editing.