ftp.nice.ch/pub/next/tools/screen/BackSpaceDuo.NIHS.bs.tar.gz#/BackSpaceDuo/Source/BlackView.h

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#import <appkit/View.h>

@interface BlackView:View
{
}

- oneStep;
- drawSelf:(const NXRect *)rects :(int)rectCount;
- (BOOL)isBoringScreenSaver;

@end

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