you must open the single player commands folder and open the game from there and it should work
well minecraft 1.2.3 single player is beta so there are no commands hopefully in the next version
Single player commands are needed.
no
no
no
you have to cyt
You get a mod, such a Single Player Commands.
it already is
Star cannon and more stuff stronger than it
In multiplayer, commands are generally started with a "/" Single player commands have not yet been added, unless you get a mod that has commands, like WorldEdit. They will be added in the next update, 1.3.
you can install Single Player Commands and there is a freecam option.