Dynamic HTML in IIS
Dynamic HTML (DHTML), which Microsoft introduced with Internet Explorer 4.0, allows you to create much richer HTML that responds to events on the client. By upgrading your HTML pages to take advantage of DHTML, you will not only enhance the user experience, you will also build Web applications that use server resources more efficiently.
DHTML controls the appearance of HTML pages by setting properties in the document object model (DOM), a model which Microsoft has proposed to the World Wide Web Consortium (W3C) as a standard.
For an example of DHTML code, see Creating DHTML Content for IIS Applications.