How do I connect two computers using USB 3.0?

This cable connects two USB3.0 hosts together. They provide chinish app for that but in Linux, you can use my patch to use it as virtual ethernet card. I managed to achieve speeds between 1-2Gbps. But you can write own driver to transfer any data: you simply write to USB EP0 and read from USB EP0 on the other side.

Host-to-Host Connections

USB 3.0 Type-A Connector Detail

Unlike USB 2.0, the new standard will allow for two host devices to be connected directly with a USB 3.0 crossover cable. This new cable features the typical Type-A connectors on each end but with a new internal wiring. This cable omits the Vbus, D+ and D- wires (USB2.0 data and voltage) and cross-routes the SuperSpeed transmit and receive connections. This crossover cable is designed for debugging and host-to-host applications and will not cause damage if plugged into a USB 2.0 port.

What software, if any, is needed; I do not know. A USB 3.0 crossover cable may be purchased online or at a few major Computer retailers.