NSSystemDefined A system-defined event. Declarationstatic const NSEventType NSSystemDefined; See AlsoDeprecatedNSLeftMouseDownNSLeftMouseUpNSRightMouseDownNSRightMouseUpNSOtherMouseDownNSOtherMouseUpNSMouseMovedNSLeftMouseDraggedNSRightMouseDraggedNSOtherMouseDraggedNSMouseEnteredNSMouseExitedNSCursorUpdateNSKeyDownNSKeyUp