Mouse event merging for several mice, how does it work?

[Martin Cracauer]

Can somebody explain to me how this works, which software layer does
it?

- when you have a notebook with a touchpad
- and a USB mouse
- then X11 will use both
- you don't have to have a xorg.conf that mentions both, it's
  automatic, and you can plug the USB mouse in and out all you want.

This was a fairly recent feature of XFree, I remember that around 2002
I had to use a ServerConfig with primary and second pointer to get
this going at the time.  I remember Linux and FreeBSD got the
"merging" around the same time.

I never understood which software layer did this merging, I don't
think it's the X server.  I have to fix it in RELENG_6, apparently,
see appended message.

Martin
-- 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Martin Cracauer <cracauer at cons.org>   http://www.cons.org/cracauer/
FreeBSD - where you want to go, today.      http://www.freebsd.org/
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