Handling Key Events

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any subclass of NSResponder can accept events
subclass NSWindow, with MyWindow
in IB, set the window to use the custom class, MyWindow

override the following method in MyWindow:

- (void)keyDown:(NSEvent *)event
{
	switch ([event keyCode]) {
		case 121:{ // page down
			if([event modifierFlags] & NSCommandKeyMask) // only do something if the command key was also pressed
				// do something
			break;
		}
	}
}