From: "John Beamish" 

The more technically-minded probably already knew about this.  We mere
mortal, otoh, are not so knowledgeable!


Start here:
http://www.heysoft.de/nt/ntfs-ads.htm

What is an alternate data stream (ADS)?

In NTFS, a file consits of different data streams. One stream holds the
security information (access rights and such things), another one holds the
"real data" you expect to be in a file. There may be another
stream with link information instead of the real data stream, if the file
actually is a link. And there may be alternate data streams, holding data
the same way the standard data stream does.



Continue here: (thanks, Geo, for the link)
http://www.sysinternals.com/Utilities/Streams.html

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