From RoboBlitz Editor Wiki
RTouch events are the event which is generated when an object touches an RTriggerVolume.
You can place an RTouch event in Kismet by selecting the RTriggerVolume in question and right clicking and selecting New Event Using RTriggerVolume_X->RTouch.
You can specify what kind of objects trigger an RTouch event by editing the events kismet properties. The bPlayerOnly variable determines whether the object triggering the event must belong to a player or not. If bPlayerOnly is checked only objects which are possesed by a player will trigger the event. Adding an Archetype to ArchetypeProximityTypes will make all instances of that archetype will trigger the RTouched event. In the same way Classes can be added to ClassProxmityTypes array to trigger the event. Remember that all classes that inherit from the specified class will also trigger the event.