What is system-config-mouse supposed to do?

[Timothy Murphy]

I tried system-config-mouse on a couple of computers,
but it didn't appear to change xorg.conf ,
even though I changed my choice of mouse.
The change worked during the current session,
but had disappeared when I logged in again.

Have I misunderstood the purpose of this command?

-- 
Timothy Murphy  
e-mail (<80k only): tim /at/ birdsnest.maths.tcd.ie
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland