Multiseat setup - gdm.conf

 [daemon]
Greeter=/etc/multiseat/scripts/multiseat-greeter

[security]
AllowRoot=true

[xdmcp]

[gui]

[greeter]
Browser=false

[chooser]

[debug]

[servers]

0=Xinerama
1=Xephyr
2=Xephyr

[server-Xinerama]
name=Xinerama
command=/usr/bin/X -br -dpms -s 0
handled=false
flexible=false

[server-Xephyr]
name=Xephyr
command=/etc/multiseat/scripts/Xephyr-seat
handled=true
flexible=false