One Quickie

Forwarding key events to another window (NSWindow->Random)
To forward key events to another window, make subclass of NSWindow and override sendEvent:
- (void) sendEvent: (NSEvent *) anEvent
    if ([anEvent type] == NSKeyDown) {
        [someOtherWindow sendEvent: anEvent];

    } else {
        [super sendEvent: anEvent];

} // sendEvent
It's up to you to figure out what "someOtherWindow" is, whether it's a delegate or an instance variable that holds the other window.

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Advanced Mac OS X Programming book