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fitfella29, if you set everything up right, the only difference between playing online with a cordless mouse, and a corded one, is that you won't have to keep pulling the cord after it caught on the edge of the desk and got you killed.
NOTE: If you are prone to fits of rage during gameplay, and take it out on your computer peripheral's and HID's, a cordless mouse will cure this, as you will find that throwing the cordless mouse across the room is not worth the time it takes to find it, or the amount of worrying you will do once you calm down and realize you might have broken it.