Informs the receiver that the user has pressed or released a modifier key (Shift, Control, and so on).
An object encapsulating information about the modifier-key event.
The default implementation simply passes this message to the next responder.
Responding to Other Kinds of Events
Informs the receiver that the mouse cursor has moved into a cursor rectangle.
Informs the receiver that a tablet-point event has occurred.
Displays context-sensitive help for the receiver if help has been registered.
Informs the receiver that the mouse’s scroll wheel has moved.
Performs a Quick Look on the content at the location specified by the supplied event.