Abstract: A computer system for associating identifiers to identified participants, the system comprising: a computer terminal having access to a record holding participant data for an event at an event location, the computer terminal comprising a processor; a first input means for receiving a participant identifier at the event location, the participant identifier generated for and unique to the participant and associated with participant data in the record, the processor configured to recall from the record participant data associated with the participant identifier; and a second input means for receiving a further unique identifier, the processor configured to transmit to the record the further unique identifier for association with the participant data in the record.