I have a Microsoft Wireless Laser Mouse 6000 and it has two side buttons along with the left and right click buttons.
command box
it for a carlon plug-in wireless chime with two buttons, one do not work, i replace batteries and it still do not work
There are 2 different versions, one that is wireless and another one that is wired. The wireless one also comes with the rest of the buttons on it...late
edit
The top bar on the left hand corner contains the buttons. You can go forward and backward on webpages with them.
In the browser, your navigation bar contains the history buttons, favorites, address bar, and a few other options depending on what browser you use.
Toolbar
They call it a Taskbar
vergas
Ribbon
task bar
how many options can be selected if a frame contains 4 option buttons