ftp.nice.ch/pub/next/tools/dock/AltDock.I.bs.tar.gz#/AltDock/Source/DockSpeaker.h

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#import <appkit/Speaker.h>
@interface DockSpeaker : Speaker
{}
-(int)unhide;
@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.