If you don't win the lottery for the first show you try, then you can try for another show. If you win, you can't enter again for another show.
The lotteries are at machines, kind of like FastPass machines, but with more steps (there's an English option). The one at Disneyland is at Tomorrowland Hall, next to Space Mountain. The one at DisneySea is at Biglietteria, kind of near the Venice canals and Ristorante di Canaletto. Yes, it's for your whole group since one of the first steps is scanning in everyone's tickets. You win or lose together.
Hope you have better luck than me. We tried over 3 days with no luck!
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