Raises the KeyDown event.
InteractiveService.prototype.onKeyDown = function(
Raising an event invokes the event handler through a function. The OnKeyDown method also allows derived classes to handle the event without attaching a function to the event. This is the preferred technique for handling the event in a derived class.
**Note to Inheritors: **When overriding OnKeyDown in a derived class, be sure to call the base class's OnKeyDown method so that registered delegates receive the event.
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