Abstract: An electronic point-of-sale (PoS) system comprises a network with a number of PoS terminals and a PoS server computer attached to it. The PoS terminals and the PoS server interact over the network to perform conventional PoS transactions. Additionally, each of the PoS terminals monitors its own operation for predetermined security-related events (such as refunds or voids). Upon detection of such an event, the PoS terminal sends an alert message and data over the network to a control computer (which may be the PoS server computer, or may be a separate computer). The control computer responds to the alert message by activating a video camera and recorder to record a view of the PoS terminal, along with the data.