If it's PS/2 you'll generally end up with a new mouse entry

/dev/input/mouse2

Create a new mouse entry in XF86Config and point it to the second mouse
device... I've successfully had a USB and PS/2 mouse working at the same
time this way, so it's completely possible.

The section should look something like this...

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/mouse"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"
EndSection


Section "InputDevice"
Identifier "Mouse1"
Driver "mouse"
Option "Protocol" "PS/2"
Option "Device" "/dev/input/mouse2"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"
EndSection

but you may also need to get imwheel to get all the buttons to work right.


-=KW=-