3 button mouse question

[Marlon Corleone]

why is it, my mouse still works when i set the device: /dev/psm0 at the xf86config
 
i choose ps/2 as the protocol, and i enable emulate 3 buttons, after that my mouse works but i cant use my mouse middle buttons since its a 3 button mouse.
 
do i have to change the device to its default? since by default FreeBSD 3 buttons mouse is set to /dev/sysmouse, and from the handbook sez if i choose 3 button mouse i have to DISABLE the emulate 3 buttons. 
 
i hope anyone can clarify and explain much better, thanks all.
 


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