I've seen people run a jumper from the neutral terminal of an outlet to the ground terminal when working in older houses with only two wire systems and no separate ground available. I know it satisfies a tester to read that the outlet is properly grounded and even allows GFCI outlets to work. I also know that in many three wire systems the ground and neutral wires all go back to the same buss in the panel anyway. My normal practice has been to run a new ground wire at least to a cold water pipe or a rod in the ground depending on which is more convenient for the location. Have I been doing a lot of extra work for nothing? Is the jumper arrangement just as safe, and is it an approved (code) procedure?