One, because the motherboard only has one mouse jack.
Although you may have a USB plug-in mouse your computer system wouldn't communicate with another mouse for it is not programed to.
a PC controller is a mouse
Throw it away.
2 and they are keyboard and mouse
PC mice commonly have physical scroll wheels and right click buttons. The new Magic Mouse for Mac has them, but they are touch sensitive, as is the entire mouse's surface.
worse
No, not on Minecraft PC. You just use your mouse and keyboard.
The Crystal Monkey PC Laptop Mouse Wrist Cushion was not designed to be heated, and is not recommended.
Generally it depends on the type of mouse and brand that one is buying. A PC mouse will cost someone around 15 to 25 dollars, or about 40 dollars for a high end one.
on net
Mouse.
left mouse button
If her mouse is wireless and your computers are close together, yes. Move computers farther apart.