Rendering Ui and execution from remote machine

The question makes no much sense because with ASP.NET, you don't render the UI. It is done only by the browser, that is, a client side. Server side only generates some resources on HTTP request, returns them in HTTP response. As to UI, this is normally HTML. In principle, for this pure client-server model, it is not very important where the HTML is actually calculated and generated, on the host receiving HTTP request and running the HTTP server, or on some other machine, indirectly. HTML is merely the text. So, the problem looks artificial.

FTP makes no much sense, but of course you can use it as you can run FTP server on one host and utilize it using FtpWebRequest class. Not clear why though.

Essentially, you should think only in terms of just two hosts (and two tiers): a client host and the server host running the HTTP server. For the client host, there is nothing else. So, you only can connect other hosts to the host of HTTP service, and these machines can be anything. If they are on the same local network and the HTTP server's host, they can run anything, and not only on Windows (you can run CLR on Mono, on many platforms, using socket networking, remoting, self-hosted (especially if you don't want IIS) WCF, FTP, really anything).

—SA