I got a Microsoft bluetooth keyboard. My Macbook Pro was able to detect it and use it. The keyboard has a lot of extra keys, such as keys to control the volume and put the computer to sleep. The Macbook Pro recognizes some of these keys and respond to them correctly. However, there are some keys which do not work, like "My Documents" and "Mail." I tried to set these keys up using keyboard shortcuts in system preferences, but when I press the key for the keyboard shortcut, the computer doesn't seem to detect anything.
How can I set up these other keys to do useful things?