Support for more than 3 buttons is available on USB or PS/2 mouse devices.
Wheel mouse scrolling is available on a USB or PS/2 mouse device. This support means that rolling the wheel on a USB or a PS/2 mouse results in a scroll in the application or window under mouse focus. StarOfficeTM, Firefox, and GNOME applications support wheel mouse scrolling. However, other applications might not support wheel mouse scrolling.