⎕EVT Event Target

The niladic system function ⎕EVT is valid only when you are running a ⎕WE callback function in response to an event. It returns a scalar object reference, which is a reference to the object which generated the event. For example, if a callback is running in response to a Click event for a .Net Button object, ⎕EVT will contain a reference to the Button.

If no event target is available, it will return a reference to the Null object.