USB to USB communication?

[gboyce-qL0WqcyiFk9Wk0Htik3J/w at public.gmane.org (Gregory Boyce)]

On Wed, 20 Jan 2010, Richard Pieri wrote:

> On Jan 20, 2010, at 4:03 PM, R. Luoma wrote:
>>
>> Has anyone tried to hook up communications between
>> two computers using the USB ports?
>
> Short version: you can't.
> Slightly longer version: you cannot have more than one root hub node on a bus chain.
> Tangential answer: there was at one point in time a device for PS2 consoles so that you could connect a PS2 (root hub) to a PC (root hub) for save game transfers.  I don't know if it's still findable, and beyond that it would require some specific drivers to make work because the whole concept is alien to USB.

They make special USB host to host network cables.

http://www.linux-usb.org/usbnet/