1. testing the performance of a computer board while comparing it to others.
2. video card has nothing to do with the bit of the os unless you are referring to the video drivers.
3. dual boot = option to choose between 2 os, option to choose between 3 oses during boot up.
yeah, really man. save yourself some face and look some stuff on your own! in a lot of ways it makes you better because you might find something you weren't looking for and otherwise wouldn't!