s M1, P1, E1, I1, (2) we can pair this RETURN up with the previous CALL by noticing that the Correlation i.d. (???CA???) matches that of the CALL event, and (3) all four events are a set because their Causality i.d. is the same, and they have two pairs of matching Correlation i.d.'s. [0194] The proper choice of a Handle depends in part on the entity causing the event.