>I don't believe that all the buttons on four button mouse will work without
> specific mouse software.

It does. All four buttons are recognized in both system (3rd is all
direction scroll function, and 4th is backward), and games. Unfortunatly
thumb button is marked as 4th, and Unreal Tournament which I mainly play is
limited to only 3 buttons, therefore I cant bind 4th.

> A keyboard with extra buttons has a special driver.

It depend on buttons, for example so called multimedia buttons like vol
up/down, play, stop etc. should work fine on windows drivers.

> What kind of a mouse is it?

Logitech Dual Optical.
Installing Logitech drivers is not an option, cause they change mouse
behavior profile which would result in temporary drop in performance which I
cannot afford right now. Besides usualy there is a lot of problems with
installing any drivers during tournaments, so drivers are disadvantage for
those used to them.

Best Regards
FWS