Modern Intel CPUs allow using JTAG-like interface through USB 3.0, it available on numerous platforms. These make it possible to control a system totally, making the technology attractive not only for debugging and research. Starting with Skylake, Intel introduced Direct Connect Interface(DCI) technology, and you can find a rather superficial description of it in the docs. Exist two types of connection: using a specific device, the so-called Intel SVT Closed Chassis Adapter, or a common USB3 Debug cable. Here I would like to note that the target system in this case does not require any software or hardware agents. We will talk about implementation of this technologies and USB3 Hosting DCI protocol.