The ID (code) for TNT in Minecraft is 46.
The gift code is the redeemable code you are emailed when someone buys a copy of Minecraft for you.
You receive a verification code for Minecraft after you buy it.
you have to make a key in minecraft. JanskeyIt is a code used to make a free Minecraft account into a premium one, and is often referred to as a gift code.
Any code released in minecraft by Mojang is copyrighted, so I can't post it here.
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If you want a Minecraft code, you should ask on the official forums (minecraftforum.net) or enter one of the many competitions on there or on YouTube.
There is no code for mutiplayer, it's already part of the game.