UPnP is short for Universal Plug and Play - it is a feature that works with some compatible routers to open the required ports automatically. TunnelEx automates creation port mappings for any routers witch supports UPnP. It can be used for simple redirection rules from Internet to LAN workstaion.

Or it could be used in conjunction with the TunnelEx to redirect connections from the Internet through HTTP proxy or a source of another type. Example to another server through HTTP proxy server or writes/reads named pipe.