I recently did an re inspection on a home that had ungrounded three prong receptacles. The electrician installed a GFCI receptacle on the first receptacle in the circuits, and labeled them as GFCI protected, and no equipment ground installed. Awesome.
I was just curious how electricians find out which one is the first receptacle. I have heard electricians call the wiring from circuit breaker to the first device, the home run.