Agreed, but since we're querying the entire network it's unlikely the other programs will change their protocol in a timely manner, which was your original point. But the not function would still work when used at the receiving end. True, it wouldn't filter undesired files that have been renamed, but most aren't, and it would be useful in filtering the unwanted porno responses when searching for the movie Holes. And it would have worked in the example given in the first post in this thread.

Jay