The software API (application programming interface) providing network A/V support in NewTek products is called AirSend™. Various systems and software (both native and third-party) also take advantage of AirSend to send and receive control instructions and tally (on air) notification.
AirSend supports more than just a/v data transfer. For example, AirSend also provides the ability to transmit commands between NewTek live production systems and other connected sources. This provides extremely powerful capabilities.