21.3. Notes
Touchpad devices like Alps Glidepoint also work, so long
they're compatible with another mouse protocol.
Newer Logitech mice (except the Mouseman) use the
Microsoft protocol and all three buttons do work. Eventhough
Microsoft's mice have only two buttons, the protocol allows
three buttons.
The mouse port on the ATI Graphics Ultra and Ultra Pro use
the Logitech busmouse protocol. (See the
Busmouse HOWTO for details.)
Take our 
