For EVENT-TYPE = "KEYPRESS", this attribute returns key functions, such as "RETURN". For EVENT-TYPE = "MOUSE", this attribute returns high-level events for both portable and three-button event types, such as "MOUSE-SELECT-CLICK" (portable) or "LEFT-MOUSE-CLICK" (three-button). For EVENT-TYPE = "PROGRESS", this attribute returns high-level widget and direct manipulation events, such as "CHOOSE" or "SELECTION".