You can only play against shots that are recorded and much of the time you will see a different outcome from what your friend is seeing. So for example, you have a 40 foot putt that misses by an inch and your friend will see it go in and congratulate on a putt you didn't really make.....
TGC doesn't have a lobby, or a live interface like most modern golf games it's one of it's only big limitations, although it has ghost balls which is something I've never seen before in golf game and a good option but I would take the tried and true lobby anyday of the week.