How can I create a client side ActiveX Control with .net

How can I create a client side ActiveX Control with .net
I know it's possible,..... does anyone know how I can do this,... I want to be able to create a chat application with .net that is embeded in the browser with a object tag. Something like this:


<object class=".netActiveXcontrolChatApp">
<param name="backcolor" value="blue">
<!----- etc, etc ------------->
</object>

I dont need detailed info on how to create the chat app,... I just need to know how to create a client side activeX control using .net that can be embeded in a browser. Please, someone point me in the right direction! A good tutorial on how to do this would be great!