Use this class (or one of its derived classes) as a base for deriving specific types of template-rendered controls. You can use an existing template that is included with Windows SharePoint Services 3.0 or create your own.
Templates are objects of type ITemplate. Typically they serve as the value of the RenderingTemplate.Template property. RenderingTemplate objects are defined in .ascx files located in the following folder:
C:\program files\common files\microsoft shared\web server extensions\12\template\controltemplates