Tom's description is correct. Just to add to it, CAPTCHA is a forced
acronym that stands for:
Completely Automated Public Turing Test to Tell Computers and Humans
Apart.
Essentially, it is designed to be a test that you are actually a human and
not some computer pretending to be a human. Judging from some of the
personalities, or lack there of, of people I work with, I believe that
some computers have beaten the test.
--
Blue skies.
Dan Rossi
Carnegie Mellon University.
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