[lossage]

My reading of Robert's Rules confirms Larry's reply.

In your situations 1 and 3, the all-in player has raised and, therefore, re-opened the betting for the first player in limit poker but not in no- or pot-limit poker. In limit, Player 1 can either fold, call, or make a full raise. In no- or pot-limit, he can only fold or call if no one else raises.

In your situation 2, the all-in bet is not a raise, and the betting is not re-opened for Player 1 if no one else raises.