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Summary FTB_API is a JavaScript object that allows access to all the FreeTextBox controls on a page

In JavaScript, you can find a particular FreeTextBox control using the following syntax:

 <script type="text/javascript">
   ftb = FTB_API['FreeTextBox1'];
   ftb.InsertHtml("some <b>text</b>");

In this example 'FreeTextBox1' is the ClientID of the FreeTextBox. The ClientID is generated by the .NET framework and can be accessed by getting ClientID.