⎕EVN Event Name

The niladic system function ⎕EVN is valid only when you are running a ⎕WE callback function in response to an event. It contains the name of the event as a character vector. For .Net, this will be one of event property names, such as 'Closed' for a Form, or 'Click' for a Button. For System classes, it will be one of the callback names beginning with 'on'.