Using the ATI Catalyst Control Center (fglrx), I setup two desktops (the multidesktop option) via dual-head. Now I have two mice and keyboards (USB) attached which, using `xinput` can be put in two separate groups. Can I lock each group to one screen? And how can this be done permanently? Alternatively, instructions for turning this "lite multiseat" configuration into multiseat are appreciated as well.

This is the xorg.conf as setup by the Catalyst Center:

```
Section "ServerLayout"
    Identifier     "amdcccle Layout"
    Screen      0  "amdcccle-Screen[1]-0" 0 0
    Screen         "amdcccle-Screen[1]-1" 1400 0
EndSection

Section "Module"
    Load  "glx"
EndSection

Section "Monitor"
    Identifier   "0-CRT1"
    Option      "VendorName" "ATI Proprietary Driver"
    Option      "ModelName" "Generic Autodetecting Monitor"
    Option      "DPMS" "true"
    Option      "PreferredMode" "1400x1050"
    Option      "TargetRefresh" "60"
    Option      "Position" "0 0"
    Option      "Rotate" "normal"
    Option      "Disable" "false"
EndSection

Section "Monitor"
    Identifier   "0-DFP1"
    Option      "VendorName" "ATI Proprietary Driver"
    Option      "ModelName" "Generic Autodetecting Monitor"
    Option      "DPMS" "true"
    Option      "PreferredMode" "1400x1050"
    Option      "TargetRefresh" "60"
    Option      "Position" "0 0"
    Option      "Rotate" "normal"
    Option      "Disable" "false"
EndSection

Section "Device"
    Identifier  "Default Device"
    Driver      "fglrx"
EndSection

Section "Device"
    Identifier  "amdcccle-Device[1]-0"
    Driver      "fglrx"
    Option      "Monitor-DFP1" "0-DFP1"
    BusID       "PCI:1:5:0"
EndSection

Section "Device"
    Identifier  "amdcccle-Device[1]-1"
    Driver      "fglrx"
    Option      "Monitor-CRT1" "0-CRT1"
    BusID       "PCI:1:5:0"
    Screen      1
EndSection

Section "Screen"
    Identifier "Default Screen"
    DefaultDepth     24
    SubSection "Display"
    EndSubSection
EndSection

Section "Screen"
    Identifier "amdcccle-Screen[1]-0"
    Device     "amdcccle-Device[1]-0"
    DefaultDepth     24
    SubSection "Display"
        Viewport   0 0
        Depth     24
    EndSubSection
EndSection

Section "Screen"
    Identifier "amdcccle-Screen[1]-1"
    Device     "amdcccle-Device[1]-1"
    DefaultDepth     24
    SubSection "Display"
        Viewport   0 0
        Depth     24
    EndSubSection
EndSection

Section "DRI"
    Group        "vglusers"
    Mode         0660
EndSection

```

(the latter entry is from [VirtualGL](http://www.virtualgl.org/), see [this question](https://unix.stackexchange.com/q/5235/863), it should be irrelevant here)