On Wed, 21 Jul 2004, Cedric Tefft wrote:

> Alan Stern wrote:
> 
> >A USB 
> >master simply cannot be made to appear as a slave.  
> >
> Not directly to be sure, but why not with the help of a little 
> additional hardware??  Isn't that what a host-to-host cable is doing? 

I'm not sure exactly what a host-to-host cable does do, but it doesn't
make either of the masters appear to be a slave.  Most likely it includes
two slaves that can communicate internally with each other (and each with
its respective master, of course).  But those slaves won't pass arbitrary
messages from one side to the other, only messages that follow the correct
protocol -- whatever that is.  This means that the slaves can't pretend to
be an arbitrary type of USB device, such as a keyboard, because they don't
follow the keyboard protocol.  They can only pretend to be a host-to-host
cable.

Alan Stern



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