USB debugging cable
    http://www.plxtech.com/products/NET2000/NET20DC/default.asp
    http://www.intel.com/technology/magazine/computing/it09021.pdf
    http://www.silabs.com/public/documents/tpub_doc/uguide/Microcontrollers/en/USB_Debug_Adapter_UG.pdf
    http://msdn2.microsoft.com/en-us/library/cc266326.aspx