Apple event
MESSAGE-BASED INTERPROCESS COMMUNICATION MECHANISM IN MAC OS, FIRST MAKING AN APPEARANCE IN SYSTEM 7 AND SUPPORTED BY EVERY VERSION OF THE CLASSIC MAC OS SINCE THEN AND BY MACOS
AppleEvent Object Model; AppleEventObjectModel; AppleEvents; Apple Events; AppleEvent; Apple Event; Scripting Bridge; Apple events; Aete
Apple events are the message-based interprocess communication mechanism in Mac OS, first making an appearance in System 7 and supported by every version of the classic Mac OS since then and by macOS. Apple events describe "high-level" events such as "open document" or "print file", whereas earlier OSs had supported much more basic events, namely "click" and "keypress".