Multiuser device support

[Artem Kachitchkine]

Jon,

I'm interested what David and other folks have to say, but I'd like to 
note that we're trying to solve an even more general problem (multi-seat 
being one of a few interesting special cases):

	http://lists.freedesktop.org/archives/hal/2005-July/002721.html

One thing to keep in mind is that HAL avoids enforcing any policies. To 
me, the exact algorithm by which devices are associated with users 
or/and user sessions is a policy. HAL can have a special set of 
properties/methods to support such policy, though.

OTOH, the separating of user sessions should probably be HAL's 
responsibility. For instance, hotplug events from one user session 
should not be visible to another. Our work is still very preliminary, 
but we're leaning towards having per-session D-BUS instances, with HAL 
presenting each session with a subset of Global Device List according to 
the session-device assignment.

There doesn't seem to be a generic way to automatically associate a 
screen with input devices, modulo special cases like keyboard/mouse 
plugged into the monitor's  built-in hub. It would be nice to have a 
flexible HAL mechanism to allow sysadmins establish their own policy.

-Artem.
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