As defined on the CAPTCHA home page at the Carnegie Melon University School of Computer Science's Web site:
CAPTCHA is a program that can generate and grade tests that:
- Most humans can pass.
- Current computer programs can't pass.

Usually Captcha is placed on a web form and it is represented by an image randomly generated. The image rapresnt a dynamic text that the user must copy in a text field. If the verification text is entered incorrectly the application will not allow the user to perform the action.
To make more difficult for text recognize application the text is slightly scrambled, rotated and/or appear over patterned background.
As a result Captcha protects web sites against unfriendly actions like mass web form spam or brute force password attacks.

The extension don't verify the code because the code must be verified server side, the extension insert only the random image and store in a session variable the random text

You must validate the form with your usually method or use our ServerSideValidation: http://www.dwzone-it.com/Extension/PhpServerSideValidate/default.asp

Documentation:
http://www.dwzone-it.com/Extension/PhpDynamicCaptcha/default.asp

Live demo:
http://www.dwzone-it.com/Extension/PhpDynamicCaptcha/demo.asp

Help and tutorials:
http://www.dwzone-it.com/Extension/PhpDynamicCaptcha/help.asp

Ui-Access
Server Behaviors >> DwZone >> Dynamic Captcha >> Dynamic Captcha Image

Support:
http://forum.dwzone-it.com

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Add the last version of the Captcha library

DwZone menu under server behaviors menu