
To the left are Captcha's - those distorted and scrambled boxes of letters and numbers used by websites to tell friend (human) from foe (other computers). Top to bottom we have examples from PayPal, Yahoo, Hotmail, TicketMaster and AOL.
CAPTCHA is a trademarked name belonging to
Carnegie Mellon University and stands for
completely
automated
public
turing-test to tell
computers and
humans
apart. If you want to know what a "
turing test" is check out the Wikipedia posting.
We in the AT field do not like Captcha's for the simple reasons that they are inaccessible for the visually impaired (in particular) and a general pain in the butt for everyone else (especially those with mobility issues that make excessive typing difficult). Heck, even with eyesight and ambulation I sometimes have trouble figuring out these darn things.
Labels: B/LV, Web_Access