4. The computer system of claim 1 , wherein the execution module is further configured to receive a punctuation event and to selectively transmit the punctuation event to each query application module.
4. The computer system of claim 1 , wherein the execution module is further configured to receive a punctuation event and to selectively transmit the punctuation event to each query application module. 6. The computer system of claim 4 , wherein each query application module for a group is configured to delete events from the group that are invalidated by the punctuation event.