From Unreal Streaming Technologies:
This software helps enabling network communications in firewall/proxy server/traffic filtering environments, where only certain traffic via HTTP protocol is allowed. Various client-server applications such as remote desktop, streaming and application servers, use custom ports and proprietary TCP protocols for IP data exchange. These programs can function in prohibitive environments using the Universal HTTP Tunnel software. The client side of a tunnel is our Universal HTTP Tunnel client application. It listens on a particular TCP port for incoming requests.
Once the request comes, the program creates an HTTP/S tunnel to the server and sends data through this tunnel using HTTP 1.1 GET requests. The server side of the tunnel is a standard Microsoft IIS Web server, extended by our Universal IIS Proxy ISAPI extension. The server side simply forwards the data to the intended recipient application running on the server computer or it's LAN. Each connection to any tunnel lasts 10 minutes. This version is the first release on CNET Download.com.