Comment 9 for bug 593493

Just a language clarification on the initial description: multi-seat and multi-head are not the same thing.

Multi seat:
 - Many users
 - One (or multiple) monitors per user, one keyboard, one mouse.
 - Each user laid out as a distinct server layout in xorg.conf
 - Each X "screen" should present a login screen

Multi head:
 - One user
 - Multiple hardware monitors
 - One server layout.
 - One X "screen" and one X "display" that spans these two monitors (though Xinerama might actually use two "displays").

It should be possible to have multi-head within multi-seat (eg two people on one system with two video cards, 4 monitors, two "screens", two "displays", two keyboards, two mice, etc)