Controlling all actvitiy in IE programmatically

Hi,

I am writing an application that needs to simulate all
user actions in the browser, programmatically. By that I
mean that my application will request html pages, fill out
forms, click on buttons and send them to the server, read
responses etc, and to the server all this has to be
completely transparent. Also, the browser should run
without an UI.

How can I use IE6 to do this? Is there any documentation
that describes the COM interfaces and how to use them to
achieve this?

Thank you,

Adrian