taxi logic re v5

Suppose, in v5, that the user vacates his landing runway via a certain taxiway. I know that at certain airports, the taxiway network is not so extensive that all taxiways lead to the "main taxiways". So, let's suppose the taxiway he chooses only leads to some godforsaken military ramp in the middle of nowhere. So, will ground be smart enough to tell the user to back-taxi on the arrival runway and take a taxiway that does lead to the parking spot you had determined, via the gate assignment logic, to be the best, or do you give a new stand? Or, will tower tell something like "turn left on papa contact ground 121.8", so we don't have to guess which turnoff to take?