Описание тега appleevents

An Apple event is a type of interprocess message that can specify complex operations and data. Apple events allow you to gather all the data necessary to accomplish a high level task into a single package that can be passed across process boundaries, evaluated, and returned with results. The Mac OS uses Apple events to communicate with applications. Apple events are also an essential part of the AppleScript scripting system, which allows users to automate actions using scriptable applications—applications that can respond to a variety of Apple events by performing operations or supplying data.