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+<com:TContent ID="body" >
+
+<h1>TCaptcha</h1>
+<com:DocLink ClassPath="System.Web.UI.WebControls.TCaptcha" />
+
+<p>
+<tt>TCaptcha</tt> displays a <a href="http://en.wikipedia.org/wiki/Captcha">CAPTCHA</a> that can be used to determine if the input is entered by a real user instead of some program. <tt>TCaptcha</tt> displays a token (a string consisting of alphanumeric characters) as an image and the user is expected to repeat the token in a text box. The token image is generated in a way such that it can be recognized by a human being, but not a program.
+</p>
+
+<p>
+To use <tt>TCaptcha</tt>, you must enable the PHP GD2 extension with TrueType font support. Unlike other CAPTCHA scripts, <tt>TCaptcha</tt> does not need session or cookie.
+</p>
+
+<p>
+The token generated by <tt>TCaptcha</tt> can be configured in several ways. To specify the length of characters in the token, set <tt>MinTokenLength</tt> and <tt>MaxTokenLength</tt>. To use case-insensitive token comparison and generate upper-case-only token, set <tt>CaseSensitive</tt> to false. More advanced users can try to set <tt>TokenAlphabet</tt> to specify which characters may appear in the generated tokens.
+</p>
+
+<p>
+To specify the appearance of the generated token image, set <tt>TokenImageTheme</tt> to be an integer between 0 and 31. You may try the following example to see how this value affects the generated token image. The size of the generated token image is determined by <tt>TokenFontSize</tt>. In particular, the image width is proportional to the font size. You may also set <tt>Width</tt> to scale the generated image to your desired size, but the scaled image may not look good.
+</p>
+
+<p>
+Upon postback, user input can be validated by calling the method <tt>TCaptcha.validate()</tt>. More easily, you can use a <tt>TCaptchaValidator</tt> to automate the validation work for you. The <tt>TCaptchaValidator</tt> has the additional benefit of being able to validate the user input on the client-side. By default, a generated token will remain unchanged during postbacks. A new token can be generated by calling <tt>TCaptcha.regenerateToken()</tt> manually.
+</p>
+
+<p>
+The following template shows a typical use of the <tt>TCaptcha</tt> control:
+</p>
+<com:TTextHighlighter Language="prado" CssClass="source">
+&lt;com:TCaptcha ID="Captcha" />
+&lt;com:TTextBox ID="Input" />
+&lt;com:TCaptchaValidator CaptchaControl="Captcha"
+                          ControlToValidate="Input"
+                          ErrorMessage="You are challenged!" />
+</com:TTextHighlighter>
+
+<com:RunBar PagePath="Controls.Samples.TCaptcha.Home" />
+
+<div class="last-modified">$Id$</div></com:TContent>
+\ No newline at end of file