What you have to do is set up some pages that will recieve and process admin requests. So basically an asp page that does not actually do any html rendering but just completes an action (in this case add a message to a message queue stored somewhere - for this example lets store it in an application variable).
You can then make a post to this page. I tend to use the XML object for this. I think the sub object is called IHTMLRequest but I am not sure.