ftp.nice.ch/pub/next/developer/resources/palettes/ObjPaletteExample.N.bs.tar.gz#/ObjectPalette/TestApp/SumObject.h

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#import <appkit/appkit.h>

@interface SumObject:Object
{
    id	sum;
    id	summandOne;
    id	summandTwo;
 }

- sumThem:sender;

@end

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