1. I know that there is under win this. As for tablets not seen.
2. Difficulties are always a lot. More convenient if it is online project. That means that all the information will be pulled from the server on the smart or tablet and install the app from the weight of the game.
3. About demand it is also controversial. As for wines such application has not gained much success. Except that there will be some specailly marketing that everyone just wants to use it even if they don't need.
In any case, a lot of problems but as they say easily not pull the fish from the pond.