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No, I'm not going to give away the ID of the pages, just the numbers for results:
Alltheweb 7,475 pages with 'uniqe id' all cloaked
Ink 1 page, however, the page was a 'keyword ranking report' for a media company, showing google search results pages :) very amusing, I must say.
Northernlight (though they are ending this) 15,157
Directhit - doesn't produce a 'total matches found figure' but there are a few pages worth :)
Altavista 33 results found
Wisenut 25 documents found
Teoma - 0 results found (though as we know, they haven't spidered with a teoma spider since Sept.)
Very, very interesting info...now I am wondering, why would anybody do this with their pages? Is there some advantage to this I can't come up with?
Can't think of a reason to do with ranking, but many like to put a unique identifier on their pages to make it easier to find which have been indexed, or when an update has taken place.
As you've shown though, it does carry some hazards.
A unique identifier is anything included in a page that is unlikely to exist on other pages, perhaps some text in an "alt=" tag, or in a keywords tag, something you can later search for and find all of your pages indexed, sometimes people do it to have a better chance of identifying their code if they suspect a page has been page jacked.
For example if you added "tkd1939" to some part of your web page code, and also added it on every page you produce, it would be easy to find your pages by searching for "tkd1939" at most search engines.