One could use a pty for this, but the one problem is that it will be a 
pain to use (think, for instance, of the fact that the mouse port will 
be different from time to time, which means reconfiguration...)

.pm

Johan Danielsson writes:
> Lennart Augustsson <augustss@cs.chalmers.se> writes:
> 
> > Just to try it out I implemented the "mouse concentrator device".
> 
> Why not do this with a userspace process, and a `loopback' character
> device? That way you can multiplex other things too.
> 
> I used to do this with a pipe when I wanted to use both a ps/2 and a
> serial mouse (before the input extension appeared). The problem with a
> pipe is that if the daemon dies, the client side gets EPIPE.
> 
> /Johan