HTTPort SDK contains a single DLL that is distributed with client applications and is functionally identical to the HTTPort application. This DLL establishes TCP tunnel through a proxy or firewall using either a CONNECT HTTP method or communicating with external HTTHost tunneling server which is also included with the SDK. Client software then connects to localhost:tunneled_port and works through proxy or firewall as though it was not there. This package also includes COM wrapper for the DLL with source and samples in VB, Delphi and C with source.